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File: docs/README-RU.md
Role: Documentation
Content type: text/markdown
Description: Documentation
Class: PHP Iteration Tools Library
Iterate and process arrays like Python itertools
Author: By
Last change:
Date: 2 years ago
Size: 145,434 bytes
 

Contents

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IterTools PHP ? ?????????????? ??? ?????? ? ???????????? ??????????

????????????? ??? PHP ?????????? itertools ? Python.

Coverage Status License

??????????

IterTools ???????????? ??? ???? ??????????? ??? ????????????:

  • ???????????? ? ?????
  • ???????????? ? ?????? ?????????? ???????

?????? ???????????? ? ?????

foreach (Multi::zip(['a', 'b'], [1, 2]) as [$letter, $number]) {
    print($letter . $number);  // a1, b2
}

?????? ???????????? ? ?????? ?????????? ???????

$result = Stream::of([1, 1, 2, 2, 3, 4, 5])
    ->distinct()                 // [1, 2, 3, 4, 5]
    ->map(fn ($x) => $x2)      // [1, 4, 9, 16, 25]
    ->filter(fn ($x) => $x < 10) // [1, 4, 9]
    ->toSum();                   // 14

?????? ?????????? ????????????? ???????? ? ?????? iterable ??????????: * array * Iterator * Generator * Traversable

??????? ??????????

??????????? ??? ???????????? ? ??????

???????????? ?????????? ?????????

| ????? | ???????? | ?????? ???? | |-----------------------------|---------------------------------------------------------------------------------------------|-------------------------------------| | chain | ??????????????? ????????? ????????? | Multi::chain($list1, $list2) | | zip | ??????????? ????????? ?????????, ???? ?? ?????????? ????? ???????? ???????? | Multi::zip($list1, $list2) | | zipEqual | ??????????? ????????? ????????? ?????? ???????, ? ?????? ?????? ???????? ??????? ?????????? | Multi::zipEqual($list1, $list2) | | zipLongest | ??????????? ????????? ?????????, ???? ?? ?????????? ????? ??????? ???????? | Multi::zipLongest($list1, $list2) |

???????????? ????? ?????????

| ????? | ???????? | ?????? ???? | |------------------------------------------------|------------------------------------------------------------------------------|-------------------------------------------------------------| | chunkwise | ????????? ?????????, ???????? ?? ????? | Single::chunkwise($data, $chunkSize) | | chunkwiseOverlap | ????????? ?????????, ???????? ?? ????????????????????? ????? | Single::chunkwiseOverlap($data, $chunkSize, $overlapSize) | | compress | ?????????? ???????? ?? ?????????, ????????? ?????????? | Single::compress($data, $selectors) | | compressAssociative | ?????????? ???????? ?? ????????? ?? ???????? ?????? | Single::compressAssociative($data, $selectorKeys) | | dropWhile | ?????????? ????????, ???? ???????? ?????????? ?????? | Single::dropWhile($data, $predicate) | | filter | ?????????? ?????? ?? ????????, ??? ??????? ???????? ?????????? ?????? | Single::filter($data) | | filterTrue | ?????????? ?????? ???????? ???????? ?? ????????? | Single::filterTrue($data) | | filterFalse | ?????????? ?????? ?????? ???????? ?? ????????? | Single::filterFalse($data, $predicate) | | filterKeys | ?????????? ?????? ?? ????????, ??? ?????? ??????? ???????? ?????????? ?????? | Single::filterKeys($data, $predicate) | | flatMap | ??????????? ????????? ? ?????????? ?????????? ?? 1 ??????? ??????????? | Single::flaMap($data, $mapper) | | flatten | ?????????????? ????????? ????????? | Single::flatten($data, [$dimensions]) | | groupBy | ?????????? ???????? ????????? | Single::groupBy($data, $groupKeyFunction, [$itemKeyFunc]) | | limit | ???????????? ???????????? ????????? ???????? ???????????? ?????? ???????? | Single::limit($data, $limit) | | map | ??????????? ????????? ? ?????????????? callback-??????? | Single::map($data, $function) | | pairwise | ????????? ????????? ??????? (? ??????????) | Single::pairwise($data) | | reindex | ??????????????? key-value ????????? | Single::reindex($data, $reindexer) | | repeat | ????????? ?????? ??????? ???????? ????? ??? | Single::repeat($item, $repetitions) | | reverse | ????????? ????????? ? ???????? ??????? | Single::reverse($data) | | slice | ?????????? ?????????? ????????? | Single::slice($data, [$start], [$count], [$step]) | | string | ????????? ?????? ??????????? | Single::string($string) | | takeWhile | ?????? ????????, ???? ???????? ?????????? ?????? | Single::takeWhile($data, $predicate) |

??????????? ????????????

| ????? | ???????? | ?????? ???? | |------------------------------|------------------------------------------------------|----------------------------------| | count | ?????????? ?????????? ?????????????????? ????? ????? | Infinite::count($start, $step) | | cycle | ?????????? ??????????? ??????? ????????? | Infinite::cycle($collection) | | repeat | ?????????? ????????? ?????? ???????? | Infinite::repeat($item) |

???????????? ????????? ????????

| ????? | ???????? | ?????? ???? | |-------------------------------------------|------------------------------------------|--------------------------------------------| | choice | ????????? ?????? ????????? ?? ?????? | Random::choice($list, $repetitions) | | coinFlip | ????????? ?????? ?????? (0 ??? 1) | Random::coinFlip($repetitions) | | number | ????????? ????? ????? | Random::number($min, $max, $repetitions) | | percentage | ????????? ???????????? ????? ????? 0 ? 1 | Random::percentage($repetitions) | | rockPaperScissors | ????????? ????? "??????-???????-??????" | Random::rockPaperScissors($repetitions) |

?????????????? ????????????

| ????? | ???????? | ?????? ???? | |--------------------------------------------|-------------------------------------|----------------------------------------------------| | runningAverage | ?????????? ???????? ??????????????? | Math::runningAverage($numbers, $initialValue) | | runningDifference | ?????????? ???????? | Math::runningDifference($numbers, $initialValue) | | runningMax | ????? ????????????? ???????? | Math::runningMax($numbers, $initialValue) | | runningMin | ????? ???????????? ???????? | Math::runningMin($numbers, $initialValue) | | runningProduct | ?????????? ???????????? | Math::runningProduct($numbers, $initialValue) | | runningTotal | ?????????? ????? | Math::runningTotal($numbers, $initialValue) |

???????????? ???????? ? ??????????????

| ????? | ???????? | ?????? ???? | |-----------------------------------------------------------------|-----------------------------------------------------------------------|--------------------------------------------------------------| | distinct | ????????? ?????????, ???????? ?????? ?????????? ???????? | Set::distinct($data) | | intersection | ??????????? ?????????? ????????? | Set::intersection(...$iterables) | | intersectionCoercive | ??????????? ?????????? ????????? ? ?????? ?????????? ????? | Set::intersectionCoercive(...$iterables) | | partialIntersection | ????????? ??????????? ?????????? ????????? | Set::partialIntersection($minCount, ...$iterables) | | partialIntersectionCoercive | ????????? ??????????? ?????????? ????????? ? ?????? ?????????? ????? | Set::partialIntersectionCoercive($minCount, ...$iterables) | | symmetricDifference | ?????????????? ??????? ?????????? ????????? | Set::symmetricDifference(...$iterables) | | symmetricDifferenceCoercive | ?????????????? ??????? ?????????? ????????? ? ?????? ?????????? ????? | Set::symmetricDifferenceCoercive(...$iterables) |

???????????? ? ???????????

| Iterator | Description | Code Snippet | |-------------------|------------------------------------------|-------------------------------------| | asort | ????????? ????????? ? ??????????? ?????? | Sort::asort($data, [$comparator]) | | sort | ????????? ????????? | Sort::sort($data, [$comparator]) |

???????????? ??????

| Iterator | Description | Code Snippet | |----------------------------|-----------------------------------------------|--------------------------------| | readCsv | ????????? ????????? ????? CSV-????? ????????? | File::readCsv($fileHandle) | | readLines | ????????? ?????????? ????? ????????? | File::readLines($fileHandle) |

?????????????? ??????????? ?????????

| Iterator | Description | Code Snippet | |-----------------------------------------------|----------------------------------------------------------------|------------------------------------------------------------------| | tee | ??????? ????????? ?????????? ??????????? ?????????? ?? ??????? | Transform::tee($data, $count) | | toArray | ??????????? ??????????? ????????? ? ?????? | Transform::toArray($data) | | toAssociativeArray | ??????????? ??????????? ????????? ? ????????????? ?????? | Transform::toAssociativeArray($data, [$keyFunc], [$valueFunc]) | | toIterator | ??????????? ??????????? ????????? ? ???????? | Transform::toIterator($data) |

??????? ? ?????????

| ????? | ???????? | ?????? ???? | |---------------------------------------------------------|------------------------------------------------------------------------------------------------------|---------------------------------------------------| | allMatch | ???????, ???? ???????? ?????????? ?????? ??? ???? ????????? ????????? | Summary::allMatch($data, $predicate) | | anyMatch | ???????, ???? ???????? ?????????? ?????? ???? ?? ??? ?????? ???????? ????????? | Summary::anyMatch($data, $predicate) | | arePermutations | ???????, ???? ????????? ???????? ?????????????? ???? ????? | Summary::arePermutations(...$iterables) | | arePermutationsCoercive | ???????, ???? ????????? ???????? ?????????????? ???? ????? (? ?????? ?????????? ?????) | Summary::arePermutationsCoercive(...$iterables) | | exactlyN | ???????, ???? ???????? ?????????? ?????? ? ???????? ??? N ????????? | Summary::exactlyN($data, $n, $predicate) | | isPartitioned | ???????, ???? ???????? ???????? ????????? ? ????????? ????? ??????? (?????????? ?????????? ????????) | Summary::isPartitioned($data, $predicate) | | isSorted | ???????, ???? ????????? ????????????? ? ?????? ??????? | Summary::isSorted($data) | | isReversed | ???????, ???? ????????? ????????????? ? ???????? ??????? | Summary::isReversed($data) | | noneMatch | ???????, ???? ???????? ?????????? ???? ??? ???? ????????? ????????? | Summary::noneMatch($data, $predicate) | | same | ???????, ???? ?????? ????????? ????????? | Summary::same(...$iterables) | | sameCount | ???????, ???? ?????? ????????? ????? ?????????? ????? | Summary::sameCount(...$iterables) |

?????????????

| ????? | ???????? | ?????? ???? | |----------------------------------------|-------------------------------------------------------------------------------------|---------------------------------------------------------------| | toAverage | ??????? ?????????????? ????????? ????????? | Reduce::toAverage($numbers) | | toCount | ????? ????????? | Reduce::toCount($data) | | toFirst | ?????? ??????? ????????? | Reduce::toFirst() | | toFirstAndLast | ?????? ? ???????? ???????? ????????? | Reduce::toFirstAndLast() | | toLast | ????????? ??????? ????????? | Reduce::toLast() | | toMax | ???????????? ??????? ????????? | Reduce::toMax($numbers, [$compareBy]) | | toMin | ??????????? ??????? ????????? | Reduce::toMin($numbers, [$compareBy]) | | toMinMax | ??????????? ? ???????????? ??????? ????????? | Reduce::toMinMax($numbers, [$compareBy]) | | toProduct | ???????????? ????????? ????????? | Reduce::toProduct($numbers) | | toRange | ??????? ????? ???????????? ? ??????????? ?????????? ????????? | Reduce::toRange($numbers) | | toString | ?????????????? ????????? ? ?????? | Reduce::toString($data, [$separator], [$prefix], [$suffix]) | | toSum | ????? ????????? ????????? | Reduce::toSum($numbers) | | toValue | ????????????? ????????? ?? ????????, ???????????? ? ?????????????? callback-??????? | Reduce::toValue($data, $reducer, $initialValue) |

?????????? ????? ??????????

????????? ??????

| ???????? | ???????? | ?????? ???? | |--------------------------------------------------|------------------------------------------------------------------------------------------------------|-----------------------------------------------------| | of | ??????? ????? ??? ?????????? ??????? ?? ?????? ????????? | Stream::of($iterable) | | ofCoinFlips | ??????? ????? ??? ?????????? ??????? ?? ??????????? ????????? ??????? ?????? | Stream::ofCoinFlips($repetitions) | | ofCsvFile | ??????? ????? ??? ?????????? ??????? ?? ????? CSV-????? | Stream::ofCsvFile($fileHandle) | | ofFileLines | ??????? ????? ??? ?????????? ??????? ?? ????? ????? | Stream::ofFileLines($fileHandle) | | ofEmpty | ??????? ????? ??? ?????????? ??????? ?? ?????? ????????? | Stream::ofEmpty() | | ofRandomChoice | ??????? ????? ??? ?????????? ??????? ?? ??????????? ????????? ??????? ???????? ?? ?????? | Stream::ofRandomChoice($items, $repetitions) | | ofRandomNumbers | ??????? ????? ??? ?????????? ??????? ?? ???????????? ?????? ????????? ????? ????? | Stream::ofRandomNumbers($min, $max, $repetitions) | | ofRandomPercentage | ??????? ????? ??? ?????????? ??????? ?? ???????????? ?????? ????????? ???????????? ????? ????? 0 ? 1 | Stream::ofRandomPercentage($repetitions) | | ofRange | ??????? ????? ??? ?????????? ??????? ?? ?????????????? ?????????? | Stream::ofRange($start, $end, $step) | | ofRockPaperScissors | ??????? ????? ??? ?????????? ??????? ?? ??????????? ????????? ??????? "??????-???????-??????" | Stream::ofRockPaperScissors($repetitions) |

?????????? ????????

| ???????? | ???????? | ?????? ???? | |---------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------| | asort | ????????? ????????? ? ??????????? ?????? | $stream->asort([$comparator]) | | chainWith | ????????? ? ????? ????????? ?????? ????????? ??? ????????????????? ???????????? | $stream->chainWith(...$iterables) | | compress | ??????????????? ?? ????????? ????????, ??????? ?? ??????? | $stream->compress($selectors) | | compressAssociative | Compress source by filtering out keys not selected | $stream->compressAssociative($selectorKeys) | | chunkwise | ????????? ????????? ? ?????????? ?? ?????? | $stream->chunkwise($chunkSize) | | chunkwiseOverlap | ????????? ????????? ? ?????????? ?? ????????????????????? ?????? | $stream->chunkwiseOverlap($chunkSize, $overlap) | | distinct | ????????? ?????????, ???????? ?????? ?????????? ???????? | $stream->distinct($strict) | | dropWhile | ?????????? ???????? ?? ?????????, ???? ???????? ?????????? ???? | $stream->dropWhile($predicate) | | filter | ?????????? ?? ????????? ?????? ?? ????????, ??? ??????? ???????? ?????????? ?????? | $stream->filterTrue($predicate) | | filterTrue | ?????????? ?????? ???????? ???????? ?? ????????? | $stream->filterTrue($predicate) | | filterFalse | ?????????? ?????? ?????? ???????? ?? ????????? | $stream->filterFalse($predicate) | | filterKeys | ?????????? ?????? ?? ????????, ??? ?????? ??????? ???????? ?????????? ?????? | $stream->filterKeys($predicate) | | flatMap | ??????????? ????????? ? ?????????? ?????????? ?? 1 ??????? ??????????? | $stream->flatMap($function) | | flatten | ?????????????? ????????? ????????? | $stream->flatten($dimensions) | | groupBy | ?????????? ???????? ?? ????????? ?? ????????? ??????? | $stream->groupBy($groupKeyFunction) | | infiniteCycle | ?????????? ??????????? ??????? ????????? | $stream->infiniteCycle() | | intersectionWith | ?????????? ??????????? ???????? ????????? ? ??????? ??????????? | $stream->intersectionWith(...$iterables) | | intersection CoerciveWith | ?????????? ??????????? ???????? ????????? ? ??????? ??????????? (? ?????? ?????????? ?????) | $stream->intersectionCoerciveWith(...$iterables) | | limit | ???????????? ???????????? ????????? ???????? ???????????? ?????? ???????? | $stream->limit($limit) | | map | ??????????? ????????? ? ?????????????? callback-??????? | $stream->map($function) | | pairwise | ????????? ????????? ??????? (? ??????????) | $stream->pairwise() | | partialIntersectionWith | ?????????? ????????? ??????????? ???????? ????????? ? ??????? ??????????? | $stream->partialIntersectionWith( $minIntersectionCount, ...$iterables) | | partialIntersection CoerciveWith | ?????????? ????????? ??????????? ???????? ????????? ? ??????? ??????????? (? ?????? ?????????? ?????) | $stream->partialIntersectionCoerciveWith( $minIntersectionCount, ...$iterables) | | reindex | ??????????????? key-value ????????? | $stream->reindex($reindexer) | | reverse | ????????? ????????? ? ???????? ??????? | $stream->reverse() | | runningAverage | ?????????? ???????? ??????????????? ????????? ????????? | $stream->runningAverage($initialValue) | | runningDifference | ?????????? ???????? ????????? ????????? | $stream->runningDifference($initialValue) | | runningMax | ????? ????????????? ???????? ?? ????????? | $stream->runningMax($initialValue) | | runningMin | ????? ???????????? ???????? ?? ????????? | $stream->runningMin($initialValue) | | runningProduct | ?????????? ???????????? ????????? ????????? | $stream->runningProduct($initialValue) | | runningTotal | ?????????? ????? ????????? ????????? | $stream->runningTotal($initialValue) | | slice | ?????????? ?????????? ????????? | $stream->slice([start], [$count], [step]) | | sort | ????????? ???????? ????????? | $stream->sort([$comparator]) | | symmetricDifferenceWith | ?????????? ?????????????? ???????? ???????? ????????? ? ??????? ??????????? | $this->symmetricDifferenceWith(...$iterables) | | symmetricDifference CoerciveWith | ?????????? ?????????????? ???????? ???????? ????????? ? ??????? ??????????? (? ?????? ?????????? ?????) | $this->symmetricDifferenceCoerciveWith( ...$iterables) | | takeWhile | ?????? ???????? ?? ?????????, ???? ???????? ?????????? ?????? | $stream->takeWhile($predicate) | | zipWith | ??????????? ????????? ????????? ?????? ? ???????, ???? ?? ?????????? ????? ???????? ???????? | $stream->zipWith(...$iterables) | | zipLongestWith | ??????????? ????????? ????????? ?????? ? ???????, ???? ?? ?????????? ????? ??????? ???????? | $stream->zipLongestWith(...$iterables) | | zipEqualWith | ??????????? ????????? ????????? ?????? ? ??????? ?????? ???????, ? ?????? ?????? ???????? ??????? ?????????? | $stream->zipEqualWith(...$iterables) |

??????????? ????????

??????? ? ?????????

| ???????? | ???????? | ?????? ???? | |------------------------------------------------------------------|------------------------------------------------------------------------------------------------------|-------------------------------------------------------| | allMatch | ???????, ???? ???????? ?????????? ?????? ??? ???? ????????? ????????? | $stream->allMatch($predicate) | | anyMatch | ???????, ???? ???????? ?????????? ?????? ???? ?? ??? ?????? ???????? ????????? | $stream->anyMatch($predicate) | | arePermutationsWith | ???????, ???? ????????? ???????? ?????????????? ???? ????? | $stream->arePermutationsWith(...$iterables) | | arePermutationsCoerciveWith | ???????, ???? ????????? ???????? ?????????????? ???? ????? (? ?????? ?????????? ?????) | $stream->arePermutationsCoerciveWith(...$iterables) | | exactlyN | ???????, ???? ???????? ?????????? ?????? ? ???????? ??? N ????????? | $stream->exactlyN($n, $predicate) | | isPartitioned | ???????, ???? ???????? ???????? ????????? ? ????????? ????? ??????? (?????????? ?????????? ????????) | $stream::isPartitioned($predicate) | | isSorted | ???????, ???? ????????? ????????????? ? ?????? ??????? | $stream->isSorted() | | isReversed | ???????, ???? ????????? ????????????? ? ???????? ??????? | $stream->isReversed() | | noneMatch | ???????, ???? ???????? ?????????? ???? ??? ???? ????????? ????????? | $stream->noneMatch($predicate) | | sameWith | ???????, ???? ?????? ????????? ????????? | $stream->sameWith(...$iterables) | | sameCountWith | ???????, ???? ?????? ????????? ????? ?????????? ????? | $stream->sameCountWith(...$iterables) |

?????????????

| Terminal Operation | Description | Code Snippet | |------------------------------------------|---------------------------------------------------------------------|---------------------------------------------------------| | toAverage | ??????? ?????????????? ????????? ????????? | $stream->toAverage() | | toCount | ????? ????????? | $stream->toCount() | | toFirst | ?????? ??????? ????????? | $stream->toFirst() | | toFirstAndLast | ?????? ? ???????? ???????? ????????? | $stream->toFirstAndLast() | | toLast | ????????? ??????? ????????? | $stream->toLast() | | toMax | ???????????? ???????? ?? ????????? ????????? | $stream->toMax([$compareBy]) | | toMin | ??????????? ???????? ?? ????????? ????????? | $stream->toMin([$compareBy]) | | toMinMax | ??????????? ? ???????????? ???????? ?? ????????? ????????? | $stream->toMinMax([$compareBy]) | | toProduct | ???????????? ????????? ????????? | $stream->toProduct() | | toString | ?????????????? ????????? ? ?????? | $stream->toString([$separator], [$prefix], [$suffix]) | | toSum | ????? ????????? ????????? | $stream->toSum() | | toRange | ??????? ????? ???????????? ? ??????????? ?????????? ????????? | $stream->toRange() | | toValue | ????????????? ????????? ?? ????????, ???????????? callback-???????? | $stream->toValue($reducer, $initialValue) |

???????? ?????????????

| Terminal Operation | Description | Code Snippet | |-------------------------------------------------|-------------------------------------------------------------|---------------------------------------------------------| | toArray | ?????????? ?????? ?? ????????? ?????? | $stream->toArray() | | toAssociativeArray | ?????????? ????????????? ?????? ?? ????????? ?????? | $stream->toAssociativeArray($keyFunc, $valueFunc) | | tee | ??????? ????????? ?????????? ??????????? ??????? ?? ??????? | $stream->tee($count) |

???????? ? ????????? ?????????

| Terminal Operation | Description | Code Snippet | |---------------------------------|-------------------------------------------------------|-------------------------------------------------------| | callForEach | ???????? callback-??????? ??? ??????? ???????? ?????? | $stream->callForEach($function) | | print | print ??????? ???????? ?????? | $stream->print([$separator], [$prefix], [$suffix]) | | printLn | print ??????? ???????? ?????? ? ????? ?????? | $stream->printLn() | | printR | print_r ??????? ???????? ?????? | $stream->printR() | | toCsvFile | ?????????? ?????????? ?????? ? CSV ???? | $stream->toCsvFile($fileHandle, [$headers]) | | toFile | ?????????? ?????????? ?????? ? ???? | $stream->toFile($fileHandle) | | var_dump | var_dump ??????? ???????? ?????? | $stream->varDump() |

?????????

???????? ?????????? ? ??????????? ? ????? composer.json ?????? ???????:

{
  "require": {
      "markrogoyski/itertools-php": "1.*"
  }
}

??????????? composer, ????? ?????????? ??????????:

$ php composer.phar install

Composer ????????? IterTools ? ????? vendor ?????? ???????. ????? ????? ?? ?????? ???????????? ?????????? ?????????? ? ?????? ?????? ???????, ????????? Composer Autoloader.

require_once __DIR__ . '/vendor/autoload.php';

?????????????? ??????? ?????????. ????????? ?????? ??????? ? ?????????, ???????? ? ???????? ?????????? ?????? ???????:

$ php composer.phar require markrogoyski/itertools-php:1.*

??????????? ??????????

  • PHP 7.4

?????????????

??? ??????? ???????? ? iterable ??????????: * array (???) * Generator (???) * Iterator (?????????) * Traversable (?????????)

???????????? ?????????? ?????????

Chain

??????????????? ????????? ????????? ???????????.

use IterTools\Multi;

$prequels = ['Phantom Menace', 'Attack of the Clones', 'Revenge of the Sith']; $originals = ['A New Hope', 'Empire Strikes Back', 'Return of the Jedi'];

foreach (Multi::chain($prequels, $originals) as $movie) {

print($movie);

} // 'Phantom Menace', 'Attack of the Clones', 'Revenge of the Sith', 'A New Hope', 'Empire Strikes Back', 'Return of the Jedi'


### Zip
??????????? ????????? ?????????, ???? ?? ?????????? ????? ???????? ????????.


use IterTools\Multi;

$languages = ['PHP', 'Python', 'Java', 'Go'];
$mascots   = ['elephant', 'snake', 'bean', 'gopher'];

foreach (Multi::zip($languages, $mascots) as [$language, $mascot]) {
    print("The {$language} language mascot is an {$mascot}.");
}
// The PHP language mascot is an elephant.
// ...

????? ????????? ?????? ???? ????????? ?? ????.

$names          = ['Ryu', 'Ken', 'Chun Li', 'Guile'];
$countries      = ['Japan', 'USA', 'China', 'USA'];
$signatureMoves = ['hadouken', 'shoryuken', 'spinning bird kick', 'sonic boom'];

foreach (Multi::zip($names, $countries, $signatureMoves) as [$name, $country, $signatureMove]) {
    $streetFighter = new StreetFighter($name, $country, $signatureMove);
}

??????????: ??? ????????? ?????? ???? ???????????? ????????????, ????? ?????????? ????? ???????? ?????????.

ZipLongest

??????????? ????????? ?????????, ???? ?? ?????????? ????? ??????? ????????.


??????????: ? ?????? ???????????? ????????? ?????? ???? ??? ????????????? ????????? ? ?????? ????????? ???????? ????? ????????????? ???????? `null`.

use IterTools\Multi;

$letters = ['A', 'B', 'C']; $numbers = [1, 2];

foreach (Multi::zipLongest($letters, $numbers) as [$letter, $number]) {

// ['A', 1], ['B', 2], ['C', null]

}


### ZipEqual
??????????? ????????? ????????? ?????? ???????, ? ?????? ?????? ???????? ??????? ??????????.

??????? `\LengthException`, ???? ????? ????????? ???????? ???????, ??? ?????? ?????????? ????? ????????.



use IterTools\Multi;

$letters = ['A', 'B', 'C'];
$numbers = [1, 2, 3];

foreach (Multi::zipEqual($letters, $numbers) as [$letter, $number]) {
    // ['A', 1], ['B', 2], ['C', 3]
}

???????????? ????? ?????????

Chunkwise

????????? ?????????, ???????? ?? ????? ?????????? ?????.


??????????? ?????? ????? ? 1.

use IterTools\Single;

$movies = [

'Phantom Menace', 'Attack of the Clones', 'Revenge of the Sith',
'A New Hope', 'Empire Strikes Back', 'Return of the Jedi',
'The Force Awakens', 'The Last Jedi', 'The Rise of Skywalker'

];

foreach (Single::chunkwise($movies, 3) as $trilogy) {

$trilogies[] = $trilogy;

} // [ // ['Phantom Menace', 'Attack of the Clones', 'Revenge of the Sith'], // ['A New Hope', 'Empire Strikes Back', 'Return of the Jedi'], // ['The Force Awakens', 'The Last Jedi', 'The Rise of Skywalker]' // ]


### Chunkwise Overlap
????????? ?????????, ???????? ?? ????????????????????? ?????.

  • ??????????? ?????? ????? ? 1.
  • ?????? ????????? ?????? ???? ?????? ????? ?????. 
use IterTools\Single;

$numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

foreach (Single::chunkwiseOverlap($numbers, 3, 1) as $chunk) {
    // [1, 2, 3], [3, 4, 5], [5, 6, 7], [7, 8, 9], [9, 10]
}

Compress

??????????????? ??????????? ???????? ?? ?????????.

use IterTools\Single;

$movies = [

'Phantom Menace', 'Attack of the Clones', 'Revenge of the Sith',
'A New Hope', 'Empire Strikes Back', 'Return of the Jedi',
'The Force Awakens', 'The Last Jedi', 'The Rise of Skywalker'

]; $goodMovies = [0, 0, 0, 1, 1, 1, 1, 0, 0];

foreach (Single::compress($movies, $goodMovies) as $goodMovie) {

print($goodMovie);

} // 'A New Hope', 'Empire Strikes Back', 'Return of the Jedi', 'The Force Awakens'


### Compress Associative
?????????? ???????? ?? ????????? ?? ???????? ??????.

  • ??????? ????? ???? ?????? ?????? ??? ????? ????? (?? ???????? ? ??????? PHP-????????). 
use IterTools\Single;
$starWarsEpisodes = [
    'I'    => 'The Phantom Menace',
    'II'   => 'Attack of the Clones',
    'III'  => 'Revenge of the Sith',
    'IV'   => 'A New Hope',
    'V'    => 'The Empire Strikes Back',
    'VI'   => 'Return of the Jedi',
    'VII'  => 'The Force Awakens',
    'VIII' => 'The Last Jedi',
    'IX'   => 'The Rise of Skywalker',
];
$originalTrilogyNumbers = ['IV', 'V', 'VI'];
foreach (Single::compressAssociative($starWarsEpisodes, $originalTrilogyNumbers) as $episode => $title) {
    print("$episode: $title" . \PHP_EOL);
}
// IV: A New Hope
// V: The Empire Strikes Back
// VI: Return of the Jedi

Drop While

?????????? ????????, ???? ???????? ?????????? ??????.

????? ???? ??? ???????? ??????? ?????? true, ??? ??????????? ???????? ???????? ? ???????.

use IterTools\Single;

$scores = [50, 60, 70, 85, 65, 90]; $predicate = fn ($x) => $x < 70;

foreach (Single::dropWhile($scores, $predicate) as $score) {

print($score);

} // 70, 85, 65, 90


### Filter
?????????? ?????? ?? ????????, ??? ??????? ???????? ?????????? ??????.



use IterTools\Single;

$starWarsEpisodes   = [1, 2, 3, 4, 5, 6, 7, 8, 9];
$goodMoviePredicate = fn ($episode) => $episode > 3 && $episode < 8;

foreach (Single::filter($starWarsEpisodes, $goodMoviePredicate) as $goodMovie) {
    print($goodMovie);
}
// 4, 5, 6, 7

Filter True

?????????? ?????? ???????? ???????? ?? ?????????. ?????????? ???????????? ??????????.

???? ???????? ?? ???????, ???????? ????????? ????????? ?????????? ? bool ??? ??????.

use IterTools\Single;

$reportCardGrades = [100, 0, 95, 85, 0, 94, 0]; foreach (Single::filterTrue($reportCardGrades) as $goodGrade) {

print($goodGrade);

} // 100, 95, 85, 94


### Filter False
?????????? ?????? ?????? ???????? ?? ?????????. ?????????? ???????????? ??????????.

???? ???????? ?? ???????, ???????? ????????? ????????? ?????????? ? `bool` ??? ??????.



use IterTools\Single;

$alerts = [0, 1, 1, 0, 1, 0, 0, 1, 1];
foreach (Single::filterFalse($alerts) as $noAlert) {
    print($noAlert);
}
// 0, 0, 0, 0

Filter Keys

?????????? ?????? ?? ????????, ??? ?????? ??????? ???????? ?????????? ??????.

use IterTools\Single;

$olympics = [

2000 => 'Sydney',
2002 => 'Salt Lake City',
2004 => 'Athens',
2006 => 'Turin',
2008 => 'Beijing',
2010 => 'Vancouver',
2012 => 'London',
2014 => 'Sochi',
2016 => 'Rio de Janeiro',
2018 => 'Pyeongchang',
2020 => 'Tokyo',
2022 => 'Beijing',

]; $summerFilter = fn ($year) => $year % 4 === 0; foreach (Single::filterKeys($olympics, $summerFilter) as $year => $hostCity) {

print("$year: $hostCity" . \PHP_EOL);

} // 2000: Sydney // 2004: Athens // 2008: Beijing // 2012: London // 2016: Rio de Janeiro // 2020: Tokyo


### Flat Map
??????????? ????????? ? ?????????? ?????????? ?? 1 ??????? ???????????.



use IterTools\Single;
$data   = [1, 2, 3, 4, 5];
$mapper = fn ($item) => [$item, -$item];
foreach (Single::flatMap($data, $mapper) as $number) {
    print($number . ' ');
}
// 1 -1 2 -2 3 -3 4 -4 5 -5

Flatten

?????????????? ????????? ?????????.

use IterTools\Single; $multidimensional = [1, [2, 3], [4, 5]]; $flattened = []; foreach (Single::flatten($multidimensional) as $number) {

$flattened[] = $number;

} // [1, 2, 3, 4, 5]


### Group By
?????????? ???????? ????????? ?? ????????? ???????.

  • ??????? `$groupKeyFunction` ?????? ?????????? ????? ???? (??? ????????? ??????) ??? ????????? ??????.
  • ??????? `$itemKeyFunction` (???????????? ????????) ????????? ????????? ????????? ??????? ?????????? ? ??????. 
use IterTools\Single;

$cartoonCharacters = [
    ['Garfield', 'cat'],
    ['Tom', 'cat'],
    ['Felix', 'cat'],
    ['Heathcliff', 'cat'],
    ['Snoopy', 'dog'],
    ['Scooby-Doo', 'dog'],
    ['Odie', 'dog'],
    ['Donald', 'duck'],
    ['Daffy', 'duck'],
];

$charactersGroupedByAnimal = [];
foreach (Single::groupBy($cartoonCharacters, fn ($x) => $x[1]) as $animal => $characters) {
    $charactersGroupedByAnimal[$animal] = $characters;
}
/*
'cat' => [
    ['Garfield', 'cat'],
    ['Tom', 'cat'],
    ['Felix', 'cat'],
    ['Heathcliff', 'cat'],
],
'dog' => [
    ['Snoopy', 'dog'],
    ['Scooby-Doo', 'dog'],
    ['Odie', 'dog'],
],
'duck' => [
    ['Donald', 'duck'],
    ['Daffy', 'duck'],
*/

Limit

???????????? ???????????? ????????? ???????? ???????????? ?????? ????????.

????????????? ??????? ????????????, ????? ????? ???????? ????????? $limit.

use IterTools\Single;

$matrixMovies = ['The Matrix', 'The Matrix Reloaded', 'The Matrix Revolutions', 'The Matrix Resurrections']; $limit = 1;

foreach (Single::limit($matrixMovies, $limit) as $goodMovie) {

print($goodMovie);

} // 'The Matrix' (and nothing else)


### Map
??????????? ????????? ? ?????????????? callback-???????.

????????? ?????????? ???????????? ????? ????????? ??????????? ?????? callback-??????? ??? ??????? ????????.



use IterTools\Single;

$grades               = [100, 99, 95, 98, 100];
$strictParentsOpinion = fn ($g) => $g === 100 ? 'A' : 'F';

foreach (Single::map($grades, $strictParentsOpinion) as $actualGrade) {
    print($actualGrade);
}
// A, F, F, F, A

Pairwise

????????? ????????? ??????? (? ??????????).

?????????? ?????? ?????????, ???? ????????? ???????? ?????? 2-? ?????????.

use IterTools\Single;

$friends = ['Ross', 'Rachel', 'Chandler', 'Monica', 'Joey', 'Phoebe'];

foreach (Single::pairwise($friends) as [$leftFriend, $rightFriend]) {

print("{$leftFriend} and {$rightFriend}");

} // Ross and Rachel, Rachel and Chandler, Chandler and Monica, ...


### Repeat
????????? ?????? ???????? ???????? ????? ???.



use IterTools\Single;

$data        = 'Beetlejuice';
$repetitions = 3;

foreach (Single::repeat($data, $repetitions) as $repeated) {
    print($repeated);
}
// 'Beetlejuice', 'Beetlejuice', 'Beetlejuice'

Reindex

??????????????? key-value ?????????, ????????? ???????-??????????.

use IterTools\Single; $data = [

[
    'title'   => 'Star Wars: Episode IV ? A New Hope',
    'episode' => 'IV',
    'year'    => 1977,
],
[
    'title'   => 'Star Wars: Episode V ? The Empire Strikes Back',
    'episode' => 'V',
    'year'    => 1980,
],
[
    'title' => 'Star Wars: Episode VI ? Return of the Jedi',
    'episode' => 'VI',
    'year' => 1983,
],

]; $reindexFunc = fn (array $swFilm) => $swFilm['episode']; $reindexedData = []; foreach (Single::reindex($data, $reindexFunc) as $key => $filmData) {

$reindexedData[$key] = $filmData;

} // [ // 'IV' => [ // 'title' => 'Star Wars: Episode IV ? A New Hope', // 'episode' => 'IV', // 'year' => 1977, // ], // 'V' => [ // 'title' => 'Star Wars: Episode V ? The Empire Strikes Back', // 'episode' => 'V', // 'year' => 1980, // ], // 'VI' => [ // 'title' => 'Star Wars: Episode VI ? Return of the Jedi', // 'episode' => 'VI', // 'year' => 1983, // ], // ]


### Reverse
????????? ????????? ? ???????? ???????.



use IterTools\Single;
$words = ['Alice', 'answers', 'your', 'questions', 'Bob'];
foreach (Single::reverse($words) as $word) {
    print($word . ' ');
}
// Bob questions your answers Alice

Slice

?????????? ?????????? ?????????.

use IterTools\Single; $olympics = [1992, 1994, 1996, 1998, 2000, 2002, 2004, 2006, 2008, 2010, 2012, 2014, 2016, 2018, 2020, 2022]; $winterOlympics = []; foreach (Single::slice($olympics, 1, 8, 2) as $winterYear) {

$winterOlympics[] = $winterYear;

} // [1994, 1998, 2002, 2006, 2010, 2014, 2018, 2022]


### String
????????? ?????? ???????????.



use IterTools\Single;

$string = 'MickeyMouse';

$listOfCharacters = [];
foreach (Single::string($string) as $character) {
    $listOfCharacters[] = $character;
}
// ['M', 'i', 'c', 'k', 'e', 'y', 'M', 'o', 'u', 's', 'e']

Take While

?????? ????????, ???? ???????? ?????????? ??????.

????????????? ??????? ????????????, ??? ?????? ???????? ??????? ?????? ????.

use IterTools\Single;

$prices = [0, 0, 5, 10, 0, 0, 9]; $isFree = fn ($price) => $price == 0;

foreach (Single::takeWhile($prices, $isFree) as $freePrice) {

print($freePrice);

} // 0, 0


## ??????????? ????????????
### Count
?????????? ?????????? ?????????????????? ????? ?????.



use IterTools\Infinite;

$start = 1;
$step  = 1;

foreach (Infinite::count($start, $step) as $i) {
    print($i);
}
// 1, 2, 3, 4, 5 ...

Cycle

?????????? ??????????? ??????? ?????????.

use IterTools\Infinite;

$hands = ['rock', 'paper', 'scissors'];

foreach (Infinite::cycle($hands) as $hand) {

RockPaperScissors::playHand($hand);

} // rock, paper, scissors, rock, paper, scissors, ...


### Repeat (Infinite)
?????????? ????????? ?????? ????????.



use IterTools\Infinite;

$dialogue = 'Are we there yet?';

foreach (Infinite::repeat($dialogue) as $repeated) {
    print($repeated);
}
// 'Are we there yet?', 'Are we there yet?', 'Are we there yet?', ...

???????????? ????????? ????????

Choice

?????????? ????????? ?????? ????????? ?? ??????.

use IterTools\Random;

$cards = ['Ace', 'King', 'Queen', 'Jack', 'Joker']; $repetitions = 10;

foreach (Random::choice($cards, $repetitions) as $card) {

print($card);

} // 'King', 'Jack', 'King', 'Ace', ... [random]


### CoinFlip
?????????? ????????? ?????? ?????? (0 ??? 1).



use IterTools\Random;

$repetitions = 10;

foreach (Random::coinFlip($repetitions) as $coinFlip) {
    print($coinFlip);
}
// 1, 0, 1, 1, 0, ... [random]

Number

?????????? ????????? ????? ?????.

use IterTools\Random;

$min = 1; $max = 4; $repetitions = 10;

foreach (Random::number($min, $max, $repetitions) as $number) {

print($number);

} // 3, 2, 5, 5, 1, 2, ... [random]


### Percentage
?????????? ????????? ???????????? ????? ????? 0 ? 1.



use IterTools\Random;

$repetitions = 10;

foreach (Random::percentage($repetitions) as $percentage) {
    print($percentage);
}
// 0.30205562629132, 0.59648594775233, ... [random]

RockPaperScissors

????????? ????? "??????-???????-??????".

use IterTools\Random;

$repetitions = 10;

foreach (Random::rockPaperScissors($repetitions) as $rpsHand) {

print($rpsHand);

} // 'paper', 'rock', 'rock', 'scissors', ... [random]


## ?????????????? ????????????
### Running Average
?????????? ???????? ??????????????? ????????? ????????? ? ???????? ????????????.



use IterTools\Math;

$grades = [100, 80, 80, 90, 85];

foreach (Math::runningAverage($grades) as $runningAverage) {
    print($runningAverage);
}
// 100, 90, 86.667, 87.5, 87

Running Difference

?????????? ???????? ????????? ????????? ? ???????? ????????????.

use IterTools\Math;

$credits = [1, 2, 3, 4, 5];

foreach (Math::runningDifference($credits) as $runningDifference) {

print($runningDifference);

} // -1, -3, -6, -10, -15

??????????? ????????? ?????? ?????????? ? ????????? ????????.

use IterTools\Math;

$dartsScores = [50, 50, 25, 50]; $startingScore = 501;

foreach (Math::runningDifference($dartsScores, $startingScore) as $runningScore) {

print($runningScore);

} // 501, 451, 401, 376, 326


### Running Max
????? ????????????? ???????? ? ???????? ????????????.



use IterTools\Math;

$numbers = [1, 2, 1, 3, 5];

foreach (Math::runningMax($numbers) as $runningMax) {
    print($runningMax);
}
// 1, 2, 2, 3, 5

Running Min

????? ???????????? ???????? ? ???????? ????????????.

use IterTools\Math;

$numbers = [3, 4, 2, 5, 1];

foreach (Math::runningMin($numbers) as $runningMin) {

print($runningMin);

} // 3, 3, 2, 2, 1


### Running Product
?????????? ???????????? ????????? ????????? ? ???????? ????????????.



use IterTools\Math;

$numbers = [1, 2, 3, 4, 5];

foreach (Math::runningProduct($numbers) as $runningProduct) {
    print($runningProduct);
}
// 1, 2, 6, 24, 120

??????????? ????????? ?????? ?????????? ? ????????? ????????.

use IterTools\Math;

$numbers      = [1, 2, 3, 4, 5];
$initialValue = 5;

foreach (Math::runningProduct($numbers, $initialValue) as $runningProduct) {
    print($runningProduct);
}
// 5, 5, 10, 30, 120, 600

Running Total

?????????? ????? ????????? ????????? ? ???????? ????????????.

use IterTools\Math;

$prices = [1, 2, 3, 4, 5];

foreach (Math::runningTotal($prices) as $runningTotal) {

print($runningTotal);

} // 1, 3, 6, 10, 15


??????????? ????????? ?????? ?????????? ? ????????? ????????.

use IterTools\Math;

$prices = [1, 2, 3, 4, 5]; $initialValue = 5;

foreach (Math::runningTotal($prices, $initialValue) as $runningTotal) {

print($runningTotal);

} // 5, 6, 8, 11, 15, 20


## ???????????? ???????? ? ??????????????
### Distinct
????????? ?????????, ??????? ?????? ?????????? ????????.

?? ????????? ????????? ????????? ? ?????? ??????? ?????????. ????????? ???????? false ????????? $strict, ????? ???????? ? ?????? ?????????? ?????.

use IterTools\Set;

$chessSet = ['rook', 'rook', 'knight', 'knight', 'bishop', 'bishop', 'king', 'queen', 'pawn', 'pawn', ... ];

foreach (Set::distinct($chessSet) as $chessPiece) {
    print($chessPiece);
}
// rook, knight, bishop, king, queen, pawn

$mixedTypes = [1, '1', 2, '2', 3];

foreach (Set::distinct($mixedTypes, false) as $datum) {
    print($datum);
}
// 1, 2, 3

Intersection

????????? ??????????? ?????????.


???? ???? ?? ? ????? ????????? ??????????? ????????????? ????????, ???????? ??????? ??????????? ??????????????.

use IterTools\Set;

$chessPieces = ['rook', 'knight', 'bishop', 'queen', 'king', 'pawn']; $shogiPieces = ['rook', 'knight', 'bishop' 'king', 'pawn', 'lance', 'gold general', 'silver general'];

foreach (Set::intersection($chessPieces, $shogiPieces) as $commonPiece) {

print($commonPiece);

} // rook, knight, bishop, king, pawn


### Intersection Coercive
????????? ??????????? ????????? ? ?????? ?????????? ?????.

???? ???? ?? ? ????? ????????? ??????????? ????????????? ????????, ???????? ??????? ??????????? ??????????????.

use IterTools\Set;

$numbers  = [1, 2, 3, 4, 5];
$numerics = ['1', '2', 3];

foreach (Set::intersectionCoercive($numbers, $numerics) as $commonNumber) {
    print($commonNumber);
}
// 1, 2, 3

Partial Intersection

????????? M-????????? ??????????? ?????????.


* ???? ???? ?? ? ????? ????????? ??????????? ????????????? ????????, ???????? ??????? ??????????? ??????????????.
* ???? `$minIntersectionCount = 1`, ???????? ??????? ??????????? ??????????????.

use IterTools\Set;

$staticallyTyped = ['c++', 'java', 'c#', 'go', 'haskell']; $dynamicallyTyped = ['php', 'python', 'javascript', 'typescript']; $supportsInterfaces = ['php', 'java', 'c#', 'typescript'];

foreach (Set::partialIntersection(2, $staticallyTyped, $dynamicallyTyped, $supportsInterfaces) as $language) {

print($language);

} // c++, java, c#, go, php


### Partial Intersection Coercive
????????? M-????????? ??????????? ????????? ? ?????? ?????????? ?????.

  • ???? ???? ?? ? ????? ????????? ??????????? ????????????? ????????, ???????? ??????? ??????????? ??????????????.
  • ???? `$minIntersectionCount = 1`, ???????? ??????? ??????????? ??????????????. 
use IterTools\Set;

$set1 = [1, 2, 3],
$set2 = ['2', '3', 4, 5],
$set3 = [1, '2'],

foreach (Set::partialIntersectionCoercive(2, $set1, $set2, $set3) as $partiallyCommonNumber) {
    print($partiallyCommonNumber);
}
// 1, 2, 3

Symmetric difference

????????? ?????????????? ???????? ?????????.


???? ???? ?? ? ????? ????????? ??????????? ????????????? ????????, ???????? ??????? ????????? ???????? ??????????????.

use IterTools\Set;

$a = [1, 2, 3, 4, 7]; $b = ['1', 2, 3, 5, 8]; $c = [1, 2, 3, 6, 9];

foreach (Set::symmetricDifference($a, $b, $c) as $item) {

print($item);

} // 1, 4, 5, 6, 7, 8, 9


### Symmetric difference Coercive
????????? ?????????????? ???????? ????????? ? ?????? ?????????? ?????.

???? ???? ?? ? ????? ????????? ??????????? ????????????? ????????, ???????? ??????? ????????? ???????? ??????????????.

use IterTools\Set;

$a = [1, 2, 3, 4, 7];
$b = ['1', 2, 3, 5, 8];
$c = [1, 2, 3, 6, 9];

foreach (Set::symmetricDifferenceCoercive($a, $b, $c) as $item) {
    print($item);
}
// 4, 5, 6, 7, 8, 9

???????????? ? ???????????

ASort

????????? ????????? ? ??????????? ??????.


???? `$comparator` ?? ???????, ???????? ????????? ?????? ???? ????????.

use IterTools\Single; $worldPopulations = [

'China'     => 1_439_323_776,
'India'     => 1_380_004_385,
'Indonesia' => 273_523_615,
'Pakistan'  => 220_892_340,
'USA'       => 331_002_651,

]; foreach (Sort::sort($worldPopulations) as $country => $population) {

print("$country: $population" . \PHP_EOL);

} // Pakistan: 220,892,340 // Indonesia: 273,523,615 // USA: 331,002,651 // India: 1,380,004,385 // China: 1,439,323,776


### Sort
????????? ?????????.

???? $comparator ?? ???????, ???????? ????????? ?????? ???? ????????.

use IterTools\Single;

$data = [3, 4, 5, 9, 8, 7, 1, 6, 2];

foreach (Single::sort($data) as $datum) {
    print($datum);
}
// 1, 2, 3, 4, 5, 6, 7, 8, 9

???????????? ??????

Read CSV

????????? ????????? ????? CSV-????? ?????????.

use IterTools\File; $fileHandle = \fopen('path/to/file.csv', 'r'); foreach (File::readCsv($fileHandle) as $row) {

print_r($row);

} // Each column field is an element of the array


### Read Lines
????????? ?????????? ????? ?????????.


use IterTools\File;
$fileHandle = \fopen('path/to/file.txt', 'r');
foreach (File::readLines($fileHandle) as $line) {
    print($line);
}

Transform

Tee

??????? ????????? ?????????? ??????????? ?????????? ?? ???????.

use IterTools\Transform; $daysOfWeek = ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat', 'Sun']; $count = 3; [$week1, $week2, $week3] = Transform::tee($data, $count); // Each $week contains iterator containing ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat', 'Sun']


### To Array
??????????? ??????????? ????????? ? ??????.



use IterTools\Transform;
$iterator = new \ArrayIterator([1, 2, 3, 4, 5]);
$array = Transform::toArray($iterator);

To Associative Array

??????????? ??????????? ????????? ? ????????????? ??????.

use IterTools\Transform; $messages = ['message 1', 'message 2', 'message 3']; $keyFunc = fn ($msg) => \md5($msg); $valueFunc = fn ($msg) => strtoupper($msg); $associativeArray = Transform::toAssociativeArray($messages, $keyFunc, $valueFunc); // [ // '1db65a6a0a818fd39655b95e33ada11d' => 'MESSAGE 1', // '83b2330607fe8f817ce6d24249dea373' => 'MESSAGE 2', // '037805d3ad7b10c5b8425427b516b5ce' => 'MESSAGE 3', // ]


### To Iterator
??????????? ??????????? ????????? ? ????????.


use IterTools\Transform;
$array = [1, 2, 3, 4, 5];
$iterator = Transform::toIterator($array);

??????? ? ?????????

All Match

?????????? ??????, ???? ??? ???? ????????? ????????? ???????? ?????? ??????.

use IterTools\Summary;

$finalFantasyNumbers = [4, 5, 6]; $isOnSuperNintendo = fn ($ff) => $ff >= 4 && $ff <= 6;

$boolean = Summary::allMatch($finalFantasyNumbers, $isOnSuperNintendo); // true

$isOnPlaystation = fn ($ff) => $ff >= 7 && $ff <= 9;

$boolean = Summary::allMatch($finalFantasyNumbers, $isOnPlaystation); // false


### Any Match
?????????? ??????, ???? ???? ?? ??? ?????? ???????? ????????? ???????? ?????? ??????.



use IterTools\Summary;

$answers          = ['fish', 'towel', 42, "don't panic"];
$isUltimateAnswer = fn ($a) => a == 42;

$boolean = Summary::anyMatch($answers, $isUltimateAnswer);
// true

Are Permutations

????????? ??????, ???? ????????? ???????? ?????????????? ???? ?????.

use IterTools\Summary; $iter = ['i', 't', 'e', 'r']; $rite = ['r', 'i', 't', 'e']; $reit = ['r', 'e', 'i', 't']; $tier = ['t', 'i', 'e', 'r']; $tire = ['t', 'i', 'r', 'e']; $trie = ['t', 'r', 'i', 'e']; $boolean = Summary::arePermutations($iter, $rite, $reit, $tier, $tire, $trie); // true


### Are Permutations Coercive
?????????? ??????, ???? ????????? ???????? ?????????????? ???? ?????
(? ?????? ?????????? ?????).



use IterTools\Summary;
$set1 = [1, 2.0, '3'];
$set2 = [2.0, '1', 3];
$set3 = [3, 2, 1];
$boolean = Summary::arePermutationsCoercive($set1, $set2, $set3);
// true

Exactly N

???????, ???? ???????? ?????????? ?????? ? ???????? ??? N ?????????.

  • ???????? ???????? ?????????????? ??????????.
  • ?? ????????? ???????? ????????? ?????????? ???????? ???????? ????????? ? ???? `bool`.

use IterTools\Summary;

$twoTruthsAndALie = [true, true, false]; $n = 2;

$boolean = Summary::exactlyN($twoTruthsAndALie, $n); // true

$ages = [18, 21, 24, 54]; $n = 4; $predicate = fn ($age) => $age >= 21;

$boolean = Summary::isSorted($ages, $n, $predicate); // false


### Is Partitioned
?????????? ??????, ???? ??? ???????? ???????? ????????? ? ????????? ????? ??????? (?????????? ?????????? ????????).

- ?????????? ?????? ??? ?????? ????????? ? ??? ????????? ? ????? ?????????.
- ???? ???????? ?? ??? ???????, ?????????? ???????? ?????????? ????? ?????????? ??? ???????? ? ???????? ????.



use IterTools\Summary;
$numbers          = [0, 2, 4, 1, 3, 5];
$evensBeforeOdds = fn ($item) => $item % 2 === 0;
$boolean = Summary::isPartitioned($numbers, $evensBeforeOdds);

Is Sorted

?????????? ??????, ???? ????????? ????????????? ? ?????? ???????.

  • ???????? ?????? ???? ????????.
  • ??? ?????? ????????? ??? ????????? ?? ?????? ???????? ?????? ?????????? ??????.

use IterTools\Summary;

$numbers = [1, 2, 3, 4, 5];

$boolean = Summary::isSorted($numbers); // true

$numbers = [3, 2, 3, 4, 5];

$boolean = Summary::isSorted($numbers); // false


### Is Reversed
?????????? ??????, ???? ????????? ????????????? ? ???????? ???????.

- ???????? ????????? ?????? ???? ????????.
- ??? ?????? ????????? ??? ????????? ?? ?????? ???????? ?????? ?????????? ??????.



use IterTools\Summary;

$numbers = [5, 4, 3, 2, 1];

$boolean = Summary::isReversed($numbers);
// true

$numbers = [1, 4, 3, 2, 1];

$boolean = Summary::isReversed($numbers);
// false

None Match

?????????? ??????, ???? ??? ???? ????????? ????????? ???????? ?????? ????.

use IterTools\Summary;

$grades = [45, 50, 61, 0]; $isPassingGrade = fn ($grade) => $grade >= 70;

$boolean = Summary::noneMatch($grades, $isPassingGrade); // true


### Same
???????, ???? ?????? ????????? ?????????.

???? ? ????? ???????? ???? ????????? ??? ?? ?????, ?? ?????? ??????.



use IterTools\Summary;

$cocaColaIngredients = ['carbonated water', 'sugar', 'caramel color', 'phosphoric acid'];
$pepsiIngredients    = ['carbonated water', 'sugar', 'caramel color', 'phosphoric acid'];

$boolean = Summary::same($cocaColaIngredients, $pepsiIngredients);
// true

$cocaColaIngredients = ['carbonated water', 'sugar', 'caramel color', 'phosphoric acid'];
$spriteIngredients   = ['carbonated water', 'sugar', 'citric acid', 'lemon lime flavorings'];

$boolean = Summary::same($cocaColaIngredients, $spriteIngredients);
// false

Same Count

???????, ???? ?????? ????????? ????? ?????????? ?????.

???? ? ????? ???????? ???? ????????? ??? ?? ?????, ?? ?????? ??????.

use IterTools\Summary;

$prequels = ['Phantom Menace', 'Attack of the Clones', 'Revenge of the Sith']; $originals = ['A New Hope', 'Empire Strikes Back', 'Return of the Jedi']; $sequels = ['The Force Awakens', 'The Last Jedi', 'The Rise of Skywalker'];

$boolean = Summary::sameCount($prequels, $originals, $sequels); // true

$batmanMovies = ['Batman Begins', 'The Dark Knight', 'The Dark Knight Rises']; $matrixMovies = ['The Matrix', 'The Matrix Reloaded', 'The Matrix Revolutions', 'The Matrix Resurrections'];

$result = Summary::sameCount($batmanMovies, $matrixMovies); // false


## Reduce
### To Average
?????????? ??????? ?????????????? ????????? ?????????.

??? ?????? ????????? ?????????? `null`.



use IterTools\Reduce;

$grades = [100, 90, 95, 85, 94];

$finalGrade = Reduce::toAverage($numbers);
// 92.8

To Count

?????????? ????? ?????? ?????????.

use IterTools\Reduce;

$someIterable = ImportantThing::getCollectionAsIterable();

$length = Reduce::toCount($someIterable); // 3


### To First
?????????? ?????? ??????? ?????????.

??????? \LengthException ???? ????????? ?????.

use IterTools\Reduce;

$input = [10, 20, 30];

$result = Reduce::toFirst($input);
// 10

To First And Last

?????????? ?????? ? ????????? ???????? ?????????.


??????? `\LengthException` ???? ???????? ? ?????? ????????? ?????.

use IterTools\Reduce;

$input = [10, 20, 30];

$result = Reduce::toFirstAndLast($input); // [10, 30]


### To Last
?????????? ????????? ??????? ?????????.

??????? \LengthException ???? ????????? ?????.

use IterTools\Reduce;

$input = [10, 20, 30];

$result = Reduce::toLast($input);
// 30

To Max

?????????? ???????????? ??????? ?????????.


- ??????? `$compareBy` ?????? ?????????? ????????? ????????.
- ???? ???????? `$compareBy` ?? ???????, ???????? ????????? ?????? ???? ????????.
- ??? ?????? ????????? ?????????? `null`.

use IterTools\Reduce;

$numbers = [5, 3, 1, 2, 4];

$result = Reduce::toMax($numbers); // 5

$movieRatings = [

[
    'title' => 'Star Wars: Episode IV - A New Hope',
    'rating' => 4.6
],
[
    'title' => 'Star Wars: Episode V - The Empire Strikes Back',
    'rating' => 4.8
],
[
    'title' => 'Star Wars: Episode VI - Return of the Jedi',
    'rating' => 4.6
],

]; $compareBy = fn ($movie) => $movie['rating']; $highestRatedMovie = Reduce::toMax($movieRatings, $compareBy); // [ // 'title' => 'Star Wars: Episode V - The Empire Strikes Back', // 'rating' => 4.8 // ];


### To Min
?????????? ??????????? ??????? ?????????.

  • ??????? `$compareBy` ?????? ?????????? ????????? ????????.
  • ???? ???????? `$compareBy` ?? ???????, ???????? ????????? ?????? ???? ????????.
  • ??? ?????? ????????? ?????????? `null`. 
use IterTools\Reduce;

$numbers = [5, 3, 1, 2, 4];

$result = Reduce::toMin($numbers);
// 1

$movieRatings = [
    [
        'title' => 'The Matrix',
        'rating' => 4.7
    ],
    [
        'title' => 'The Matrix Reloaded',
        'rating' => 4.3
    ],
    [
        'title' => 'The Matrix Revolutions',
        'rating' => 3.9
    ],
    [
        'title' => 'The Matrix Resurrections',
        'rating' => 2.5
    ],
];
$compareBy = fn ($movie) => $movie['rating'];
$lowestRatedMovie = Reduce::toMin($movieRatings, $compareBy);
// [
//     'title' => 'The Matrix Resurrections',
//     'rating' => 2.5
// ]

To Min Max

?????????? ??????????? ? ???????????? ???????? ?????????.


- ??????? `$compareBy` ?????? ?????????? ????????? ????????.
- ???? ???????? `$compareBy` ?? ???????, ???????? ????????? ?????? ???? ????????.
- ??? ?????? ????????? ?????????? `[null, null]`.

use IterTools\Reduce;

$numbers = [1, 2, 7, -1, -2, -3];;

[$min, $max] = Reduce::toMinMax($numbers); // [-3, 7]

$reportCard = [

[
    'subject' => 'history',
    'grade' => 90
],
[
    'subject' => 'math',
    'grade' => 98
],
[
    'subject' => 'science',
    'grade' => 92
],
[
    'subject' => 'english',
    'grade' => 85
],
[
    'subject' => 'programming',
    'grade' => 100
],

]; $compareBy = fn ($class) => $class['grade']; $bestAndWorstSubject = Reduce::toMinMax($reportCard, $compareBy); // [ // [ // 'subject' => 'english', // 'grade' => 85 // ], // [ // 'subject' => 'programming', // 'grade' => 100 // ], // ]


### To Product
?????????? ???????????? ????????? ?????????.

??? ?????? ????????? ?????????? `null`.



use IterTools\Reduce;

$primeFactors = [5, 2, 2];

$number = Reduce::toProduct($primeFactors);
// 20

To Range

?????????? ???????? ????????????? ? ???????????? ????????? ?????????.


??? ?????? ????????? ?????????? `0`.

use IterTools\Reduce;

$grades = [100, 90, 80, 85, 95];

$range = Reduce::toRange($numbers); // 20


### To String
??????????? ????????? ? ??????, "????????" ?? ????????.

* ???????? ??????????????? ????????? `$separator` ??????????? ? ???????? ??????????? ????? ?????????? ? ??????.
* ???????? ??????????????? ????????? `$prefix` ??????????? ? ?????? ??????.
* ???????? ??????????????? ????????? `$suffix` ??????????? ? ????? ??????.



use IterTools\Reduce;

$words = ['IterTools', 'PHP', 'v1.0'];

$string = Reduce::toString($words);
// IterToolsPHPv1.0
$string = Reduce::toString($words, '-');
// IterTools-PHP-v1.0
$string = Reduce::toString($words, '-', 'Library: ');
// Library: IterTools-PHP-v1.0
$string = Reduce::toString($words, '-', 'Library: ', '!');
// Library: IterTools-PHP-v1.0!

To Sum

?????????? ????? ????????? ?????????.

use IterTools\Reduce;

$parts = [10, 20, 30];

$sum = Reduce::toSum($parts); // 60


### To Value
?????????? ????????? ?? ????????, ???????????? ? ?????????????? callback-???????.



use IterTools\Reduce;

$input = [1, 2, 3, 4, 5];
$sum   = fn ($carry, $item) => $carry + $item;

$result = Reduce::toValue($input, $sum, 0);
// 15

?????????? ????? ??????????

????????????? ?????? ??????? ????????? ??? ?????????????? ???????? ? ?????? ??????????? ????????? ? ??????? ????????? ????????.

?????? ?????????? ???????? ? ????:

  1. ????????? ?????? ??? ???????? ???????, ???????????????? ??????? ????????? ??? ?????? ? ???????????? ??????????.
  2. ?????? ??? ?????????????? ???????? ????????? ?????? ? ????? ?????. 
  3. ??????? ?????????? ?????? ??????????????:
* ??????, ????????????? ????? ? ????????? ???????? ??? ? ????????? ??????.
$result = Stream::of([1, 1, 2, 2, 3, 4, 5])
   ->distinct()                      // [1, 2, 3, 4, 5]
   ->map(fn ($x) => $x2)           // [1, 4, 9, 16, 25]
   ->filterTrue(fn ($x) => $x < 10)  // [1, 4, 9]
   ->toSum();                        // 14

    * ??????????? ?????????????? ????????? ?????? ?? ????? ????? ? ?????????????? ????? `foreach`.
    $result = Stream::of([1, 1, 2, 2, 3, 4, 5]) ->distinct() // [1, 2, 3, 4, 5] ->map(fn ($x) => $x2) // [1, 4, 9, 16, 25] ->filterTrue(fn ($x) => $x < 10); // [1, 4, 9] foreach ($result as $item) { // 1, 4, 9 }

????????? ??????

Of

??????? ????? ?? ?????? ?????????.

use IterTools\Stream;

$iterable = [1, 2, 3];

$result = Stream::of($iterable)

->chainWith([4, 5, 6], [7, 8, 9])
->zipEqualWith([1, 2, 3, 4, 5, 6, 7, 8, 9])
->toValue(fn ($carry, $item) => $carry + array_sum($item));

// 90


#### Of Coin Flips
??????? ????? ?? ??????????? ????????? ??????? ??????.



use IterTools\Stream;

$result = Stream::ofCoinFlips(10)
    ->filterTrue()
    ->toCount();
// 5 (random)

Of CSV File

??????? ????? ?? ????? CSV-?????.

use IterTools\Stream; $fileHandle = \fopen('path/to/file.csv', 'r'); $result = Stream::of($fileHandle)

->toArray();


#### Of Empty
??????? ????? ?? ?????? ?????????.



use IterTools\Stream;

$result = Stream::ofEmpty()
    ->chainWith([1, 2, 3])
    ->toArray();
// 1, 2, 3

Of File Lines

??????? ????? ?? ????? ?????.

use IterTools\Stream; $fileHandle = \fopen('path/to/file.txt', 'r'); $result = Stream::of($fileHandle)

->map('strtoupper');
->toArray();


#### Of Random Choice
??????? ????? ?? ??????????? ????????? ??????? ???????? ?? ??????.



use IterTools\Stream;

$languages = ['PHP', 'Go', 'Python'];

$languages = Stream::ofRandomChoice($languages, 5)
    ->toArray();
// 'Go', 'PHP', 'Python', 'PHP', 'PHP' (random)

Of Random Numbers

??????? ????? ?? ???????????? ?????? ????????? ????? ?????.

use IterTools\Stream;

$min = 1; $max = 3; $reps = 7;

$result = Stream::ofRandomNumbers($min, $max, $reps)

->toArray();

// 1, 2, 2, 1, 3, 2, 1 (random)


#### Of Random Percentage
??????? ????? ?? ???????????? ?????? ????????? ???????????? ????? ????? 0 ? 1.



use IterTools\Stream;

$stream = Stream::ofRandomPercentage(3)
    ->toArray();
// 0.8012566976245, 0.81237281724151, 0.61676896329459 [random]

Of Range

??????? ????? ??? ?????????? ??????? ?? ?????????????? ??????????.

use IterTools\Stream; $numbers = Stream::ofRange(0, 5)

->toArray();

// 0, 1, 2, 3, 4, 5


#### Of Rock Paper Scissors
??????? ????? ?? ??????????? ????????? ??????? "??????-???????-??????".



use IterTools\Stream;

$rps = Stream::ofRockPaperScissors(5)
    ->toArray();
// 'paper', 'rock', 'rock', 'scissors', 'paper' [random]

?????????? ????????

ASort

????????? ????????? ? ?????? ? ??????????? ??????.


???? `$comparator` ?? ???????, ???????? ???????? ????????? ?????? ???? ????????.

use IterTools\Stream; $worldPopulations = [

'China'     => 1_439_323_776,
'India'     => 1_380_004_385,
'Indonesia' => 273_523_615,
'USA'       => 331_002_651,

]; $result = Stream::of($worldPopulations)

->filter(fn ($pop) => $pop > 300_000_000)
->asort()
->toAssociativeArray();

// USA => 331_002_651, // India => 1_380_004_385, // China => 1_439_323_776,


#### Chain With
????????? ? ????? ?????????? ????????? ?????? ????????? ??? ????????????????? ????????????.

??????? ???? ??????? ?????????????????? ?? ?????????????????? ? ?????? ? ?????????? ?????? ???????????????????.

use IterTools\Stream;

$input = [1, 2, 3];

$result = Stream::of($input)
    ->chainWith([4, 5, 6])
    ->chainWith([7, 8, 9])
    ->toArray();
// 1, 2, 3, 4, 5, 6, 7, 8, 9

Compress

??????????????? ?? ?????? ????????, ??????? ?? ???????.


?????? ?????????? ????????, ????? ???????? ???????? ? ??????? (???????? ????????? `1`),
? ????? ????????? (???????? ????????? `0`).

use IterTools\Stream;

$input = [1, 2, 3];

$result = Stream::of($input)

->compress([0, 1, 1])
->toArray();

// 2, 3


#### Compress Associative
???????? ?? ???????? ????????? ???????? ?? ???????? ??????.

  • ??????? ????? ???? ?????? ?????? ??? ????? ????? (?? ???????? ? ??????? PHP-????????). 
use IterTools\Stream;
$starWarsEpisodes = [
    'I'    => 'The Phantom Menace',
    'II'   => 'Attack of the Clones',
    'III'  => 'Revenge of the Sith',
    'IV'   => 'A New Hope',
    'V'    => 'The Empire Strikes Back',
    'VI'   => 'Return of the Jedi',
    'VII'  => 'The Force Awakens',
    'VIII' => 'The Last Jedi',
    'IX'   => 'The Rise of Skywalker',
];
$sequelTrilogyNumbers = ['VII', 'VIII', 'IX'];
$sequelTrilogy = Stream::of($starWarsEpisodes)
    ->compressAssociative($sequelTrilogyNumbers)
    ->toAssociativeArray();
// 'VII'  => 'The Force Awakens',
// 'VIII' => 'The Last Jedi',
// 'IX'   => 'The Rise of Skywalker',

Chunkwise

????????? ???????? ?? ?????? ? ?????????? ?? ??????.


??????????? ?????? ????? ? 1.

use IterTools\Stream;

$friends = ['Ross', 'Rachel', 'Chandler', 'Monica', 'Joey'];

$result = Stream::of($friends)

->chunkwise(2)
->toArray();

// ['Ross', 'Rachel'], ['Chandler', 'Monica'], ['Joey']


#### Chunkwise Overlap
????????? ???????? ?? ?????? ? ?????????? ?? ????????????????????? ??????.

  • ??????????? ?????? ????? ? 1.
  • ?????? ????????? ?????? ???? ?????? ????? ?????. 
use IterTools\Stream;

$numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9];

$result = Stream::of($friends)
    ->chunkwiseOverlap(3, 1)
    ->toArray()
// [1, 2, 3], [3, 4, 5], [5, 6, 7], [7, 8, 9]

Distinct

????????? ???????? ?? ??????, ???????? ?????? ?????????? ????????.


?? ????????? ????????? ????????? ? ?????? ??????? ?????????. ????????? ???????? `false` ????????? `$strict`, ????? ???????? ? ?????? ?????????? ?????.

use IterTools\Stream;

$input = [1, 2, 1, 2, 3, 3, '1', '1', '2', '3']; $stream = Stream::of($input)

->distinct()
->toArray();

// 1, 2, 3, '1', '2', '3'

$stream = Stream::of($input)

->distinct(false)
->toArray();

// 1, 2, 3


#### Drop While
?????????? ???????? ?? ??????, ???? ???????? ?????????? ????.

????? ???? ??? ???????? ??????? ?????? true, ??? ??????????? ???????? ???????? ? ???????.

use IterTools\Stream;

$input = [1, 2, 3, 4, 5]

$result = Stream::of($input)
    ->dropWhile(fn ($value) => $value < 3)
    ->toArray();
// 3, 4, 5

Filter

?????????? ?? ?????? ?????? ?? ????????, ??? ??????? ???????? ?????????? ??????.


?? ????????? (???? ?? ???????) ???????? ???????? ???????? ????????? ? `bool`.

use IterTools\Stream;

$input = [1, -1, 2, -2, 3, -3];

$result = Stream::of($input)

->filter(fn ($value) => $value > 0)
->toArray();

// 1, 2, 3


#### Filter True
?????????? ?? ?????? ?????? ???????? ????????. ?????????? ???????????? ??????????.

?? ????????? (???? ?? ???????) ???????? ???????? ???????? ????????? ? bool.

use IterTools\Stream;
$input = [0, 1, 2, 3, 0, 4];
$result = Stream::of($input)
    ->filterTrue()
    ->toArray();
// 1, 2, 3, 4

Filter False

?????????? ?? ?????? ?????? ?????? ????????. ?????????? ???????????? ??????????.


?? ????????? (???? ?? ???????) ???????? ???????? ???????? ????????? ? `bool`.

use IterTools\Stream;

$input = [0, 1, 2, 3, 0, 4];

$result = Stream::of($input)

->filterFalse(fn ($value) => $value > 0)
->filterFalse()
->toArray();

// 0, 0


#### Filter Keys
?????????? ?? ?????? ?????? ?? ????????, ??? ?????? ??????? ???????? ?????????? ??????.



$olympics = [
    2000 => 'Sydney',
    2002 => 'Salt Lake City',
    2004 => 'Athens',
    2006 => 'Turin',
    2008 => 'Beijing',
    2010 => 'Vancouver',
    2012 => 'London',
    2014 => 'Sochi',
    2016 => 'Rio de Janeiro',
    2018 => 'Pyeongchang',
    2020 => 'Tokyo',
    2022 => 'Beijing',
];
$winterFilter = fn ($year) => $year % 4 === 2;
$result = Stream::of($olympics)
    ->filterKeys($winterFilter)
    ->toAssociativeArray();
}
// 2002 => Salt Lake City
// 2006 => Turin
// 2010 => Vancouver
// 2014 => Sochi
// 2018 => Pyeongchang
// 2022 => Beijing

Flat Map

??????????? ????????? ?? ?????? ? ?????????? ?????????? ?? 1 ??????? ???????????.

$data = [1, 2, 3, 4, 5]; $mapper fn ($item) => ($item % 2 === 0) ? [$item, $item] : $item; $result = Stream::of($data)

->flatMap($mapper)
->toArray();

// [1, 2, 2, 3, 4, 4, 5]


#### Flatten
?????????????? ????????? ????????? ?? ??????.



$data = [1, [2, 3], [4, 5]];
$result = Stream::of($data)
    ->flatten($mapper)
    ->toArray();
// [1, 2, 3, 4, 5]

Group By

?????????? ???????? ?? ?????? ?? ????????? ???????.


??????? `$groupKeyFunction` ?????? ?????????? ????? ???? ??? ????????? ??????.

use IterTools\Stream;

$input = [1, -1, 2, -2, 3, -3];

$result = Stream::of($input)

->groupBy(fn ($item) => $item > 0 ? 'positive' : 'negative');

foreach ($result as $group => $item) {

// 'positive' => [1, 2, 3], 'negative' => [-1, -2, -3]

}


#### Infinite Cycle
?????????? ??????????? ??????? ????????? ??????.



use IterTools\Stream;

$input = [1, 2, 3];

$result = Stream::of($input)
    ->infiniteCycle()
    ->print();
// 1, 2, 3, 1, 2, 3, ...

Intersection With

??????????? ???????? ? ?????? ????????? ? ??????? ??????????? ???????????.

use IterTools\Stream;

$numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]; $numerics = ['1', '2', 3, 4, 5, 6, 7, '8', '9']; $oddNumbers = [1, 3, 5, 7, 9, 11];

$stream = Stream::of($numbers)

->intersectionWith($numerics, $oddNumbers)
->toArray();

// 3, 5, 7


#### Intersection Coercive With
??????????? ???????? ? ?????? ????????? ? ??????? ??????????? ??????????? ? ?????? ?????????? ?????.



use IterTools\Stream;

$languages          = ['php', 'python', 'c++', 'java', 'c#', 'javascript', 'typescript'];
$scriptLanguages    = ['php', 'python', 'javascript', 'typescript'];
$supportsInterfaces = ['php', 'java', 'c#', 'typescript'];

$stream = Stream::of($languages)
    ->intersectionCoerciveWith($scriptLanguages, $supportsInterfaces)
    ->toArray();
// 'php', 'typescript'

Limit

???????????? ???????????? ????????? ?? ?????? ???????? ???????????? ?????? ????????.

????????????? ??????? ????????????, ????? ????? ???????? ????????? $limit.

Use IterTools\Single;

$matrixMovies = ['The Matrix', 'The Matrix Reloaded', 'The Matrix Revolutions', 'The Matrix Resurrections']; $limit = 1;

$goodMovies = Stream::of($matrixMovies)

->limit($limit)
->toArray();

// 'The Matrix' (and nothing else)


#### Map
??????????? ???????? ? ?????? ????????? ? ?????????????? callback-???????.



use IterTools\Stream;

$grades = [100, 95, 98, 89, 100];

$result = Stream::of($grades)
    ->map(fn ($grade) => $grade === 100 ? 'A' : 'F')
    ->toArray();
// A, F, F, F, A

Pairwise

????????? ???????? ?? ?????? ??????? (? ??????????).


???????? ????? ???????? ??????, ???? ???????? ???????? ?????? 2-? ?????????.

use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$stream = Stream::of($input)

->pairwise()
->toArray();

// [1, 2], [2, 3], [3, 4], [4, 5]


#### Partial Intersection With
????????? ??????????? ???????? ? ?????? ????????? ? ??????? ??????????? ???????????.



use IterTools\Stream;

$numbers    = [1, 2, 3, 4, 5, 6, 7, 8, 9];
$numerics   = ['1', '2', 3, 4, 5, 6, 7, '8', '9'];
$oddNumbers = [1, 3, 5, 7, 9, 11];

$stream = Stream::of($numbers)
    ->partialIntersectionWith($numerics, $oddNumbers)
    ->toArray();
// 1, 3, 4, 5, 6, 7, 9

Partial Intersection Coercive With

????????? ??????????? ???????? ? ?????? ????????? ? ??????? ??????????? ???????????, ??????????? ? ?????? ?????????? ?????.

use IterTools\Stream;

$languages = ['php', 'python', 'c++', 'java', 'c#', 'javascript', 'typescript']; $scriptLanguages = ['php', 'python', 'javascript', 'typescript']; $supportsInterfaces = ['php', 'java', 'c#', 'typescript'];

$stream = Stream::of($languages)

->partialIntersectionCoerciveWith(2, $scriptLanguages, $supportsInterfaces)
->toArray();

// 'php', 'python', 'java', 'typescript', 'c#', 'javascript'


#### Reindex
??????????????? key-value ????????? ?? ??????, ????????? ???????-??????????.



use IterTools\Single;
$data = [
    [
        'title'   => 'Star Wars: Episode IV ? A New Hope',
        'episode' => 'IV',
        'year'    => 1977,
    ],
    [
        'title'   => 'Star Wars: Episode V ? The Empire Strikes Back',
        'episode' => 'V',
        'year'    => 1980,
    ],
    [
        'title' => 'Star Wars: Episode VI ? Return of the Jedi',
        'episode' => 'VI',
        'year' => 1983,
    ],
];
$reindexFunc = fn (array $swFilm) => $swFilm['episode'];
$reindexResult = Stream::of($data)
    ->reindex($reindexFunc)
    ->toAssociativeArray();
// [
//     'IV' => [
//         'title'   => 'Star Wars: Episode IV ? A New Hope',
//         'episode' => 'IV',
//         'year'    => 1977,
//     ],
//     'V' => [
//         'title'   => 'Star Wars: Episode V ? The Empire Strikes Back',
//         'episode' => 'V',
//         'year'    => 1980,
//     ],
//     'VI' => [
//         'title' => 'Star Wars: Episode VI ? Return of the Jedi',
//         'episode' => 'VI',
//         'year' => 1983,
//     ],
// ]

Reverse

????????? ????????? ?? ?????? ? ???????? ???????.

use IterTools\Stream; $words = ['are', 'you', 'as', 'bored', 'as', 'I', 'am']; $reversed = Stream::of($words)

->reverse()
->toString(' ');

// am I as bored as you are


#### Running Average
??????????? ??????? ?????????????? ????????? ?? ?????? ? ???????? ????????????.



use IterTools\Stream;

$input = [1, 3, 5];

$result = Stream::of($input)
    ->runningAverage();

foreach ($result as $item) {
    // 1, 2, 3
}

Running Difference

??????????? ???????? ????????? ?? ?????? ? ???????? ????????????.

use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($input)

->runningDifference()
->toArray();

// -1, -3, -6, -10, -15


#### Running Max
?????????? ?????, ?????? ???????????? ??????? ?? ????????? ?????? ? ???????? ????????????.



use IterTools\Stream;

$input = [1, -1, 2, -2, 3, -3];

$result = Stream::of($input)
    ->runningMax()
    ->toArray();
// 1, 1, 2, 2, 3, 3

Running Min

?????????? ?????, ?????? ??????????? ??????? ?? ????????? ?????? ? ???????? ????????????.

use IterTools\Stream;

$input = [1, -1, 2, -2, 3, -3];

$result = Stream::of($input)

->runningMin()
->toArray();

// 1, -1, -1, -2, -2, -3


#### Running Product
?????????? ?????, ????????????? ???????????? ????????? ?? ????????? ?????? ? ???????? ????????????.



use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($input)
    ->runningProduct()
    ->toArray();
// 1, 2, 6, 24, 120

Running Total

?????????? ?????, ????????????? ????? ????????? ?? ????????? ?????? ? ???????? ????????????.

use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($input)

->runningTotal()
->toArray();

// 1, 3, 6, 10, 15


#### Slice
???????? ?????????? ????????? ?? ??????.



use IterTools\Stream;
$olympics = [1992, 1994, 1996, 1998, 2000, 2002, 2004, 2006, 2008, 2010, 2012, 2014, 2016, 2018, 2020, 2022];
$summerOlympics = Stream::of($olympics)
    ->slice(0, 8, 2)
    ->toArray();
// [1992, 1996, 2000, 2004, 2008, 2012, 2016, 2020]

Sort

????????? ???????? ? ?????? ?????????.


???? `$comparator` ?? ???????, ???????? ???????? ????????? ?????? ???? ????????.

use IterTools\Stream;

$input = [3, 4, 5, 9, 8, 7, 1, 6, 2];

$result = Stream::of($input)

->sort()
->toArray();

// 1, 2, 3, 4, 5, 6, 7, 8, 9


#### Symmetric difference With
?????????? ?????, ?????????? ?????????????? ???????? ????????? ?????? ? ???????? ??????? ?????????.

???? ???? ?? ? ????? ????????? ??? ? ?????? ??????????? ????????????? ????????, ???????? ??????? ????????? ???????? ??? ??????????????.

use IterTools\Stream;

$a = [1, 2, 3, 4, 7];
$b = ['1', 2, 3, 5, 8];
$c = [1, 2, 3, 6, 9];

$stream = Stream::of($a)
    ->symmetricDifferenceWith($b, $c)
    ->toArray();
// '1', 4, 5, 6, 7, 8, 9

Symmetric difference Coercive With

?????????? ?????, ?????????? ?????????????? ???????? ????????? ?????? ? ???????? ??????? ?????????, ?????????? ? ?????? ?????????? ?????.


???? ???? ?? ? ????? ????????? ??? ? ?????? ??????????? ????????????? ????????, ???????? ??????? ????????? ???????? ??? ??????????????.

use IterTools\Stream;

$a = [1, 2, 3, 4, 7]; $b = ['1', 2, 3, 5, 8]; $c = [1, 2, 3, 6, 9];

$stream = Stream::of($a)

->symmetricDifferenceCoerciveWith($b, $c)
->toArray();

// 4, 5, 6, 7, 8, 9


#### Take While
????????? ???????? ? ??????, ???? ???????? ?????????? ??????.

  • ????????????? ??????? ????????, ??? ?????? ???????? ??????? ?????? ????.
  • ?? ????????? (???? ?? ???????) ???????? ???????? ???????? ????????? ? `bool`. 
use IterTools\Stream;

$input = [1, -1, 2, -2, 3, -3];

$result = Stream::of($input)
    ->takeWhile(fn ($value) => abs($value) < 3);

foreach ($result as $item) {
    // 1, -1, 2, -2
}

Zip With

??????????? ????????? ???????? ?? ?????? ?????? ? ?????????? ?????????? ?????????, ???? ?? ?????????? ????? ???????? ????????.


* ??????? ????????, ??????? ?????????? ?????? ?? ?????????? ??????????.
* ???????? ?????????? ??????? `zip()` ? Python.
* ??? ????????? ?????? ????? ?????????? ??????? ???????????? ?? ???????, ???? ????? ???????? ????????? ?? ??????????.

use IterTools\Stream;

$input = [1, 2, 3];

$stream = Stream::of($input)

->zipWith([4, 5, 6])
->zipWith([7, 8, 9])
->toArray();

// [1, 4, 7], [2, 5, 8], [3, 6, 9]


#### Zip Longest With
??????????? ????????? ???????? ?? ?????? ?????? ? ?????????? ?????????? ?????????, ???? ?? ?????????? ????? ??????? ????????.

  • ??????? ????????, ??????? ?????????? ?????? ?? ?????????? ??????????.
  • ???????? ?????????? ??????? `zip_longest()` ? Python.
  • ??? ????????? ?????? ????? ?????????? ??????? ???????????? ?? ???????, ???? ????? ??????? ????????? ?? ??????????.
  • ??? ????????? ?????? ????? ?????? ?????? ????????? `null` ??? ?????????, ??????? ???????????. 
use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($input)
    ->zipLongestWith([4, 5, 6])
    ->zipLongestWith([7, 8, 9, 10]);

foreach ($result as $item) {
    // [1, 4, 7], [2, 5, 8], [3, 6, 9], [4, null, 10], [null, null, 5]
}

Zip Equal With

??????????? ????????? ???????? ?? ?????? ?????? ? ?????????? ?????????? ????????? (??? ????????? ?????? ???? ????? ?????).


???????? ??? `Multi::zip()`, ?? ??????? `\LengthException`, ????? ??????????, ??? ????? ????????? ??????
(????? ?????????? ????? ???????? ?????????).

use IterTools\Stream;

$input = [1, 2, 3];

$result = Stream::of($input)

->zipEqualWith([4, 5, 6])
->zipEqualWith([7, 8, 9]);

foreach ($result as $item) {

// [1, 4, 7], [2, 5, 8], [3, 6, 9]

}


### ??????????? ????????

#### ??????? ? ??????
##### All Match
?????????? ??????, ???? ??? ???? ????????? ?? ?????? ???????? ?????????? ??????.



use IterTools\Summary;

$finalFantasyNumbers = [4, 5, 6];
$isOnSuperNintendo   = fn ($ff) => $ff >= 4 && $ff <= 6;

$boolean = Stream::of($finalFantasyNumbers)
    ->allMatch($isOnSuperNintendo);
// true

Any Match

?????????? ??????, ???? ???? ?? ??? ?????? ???????? ?? ?????? ???????? ?????????? ??????.

use IterTools\Summary;

$answers = ['fish', 'towel', 42, "don't panic"]; $isUltimateAnswer = fn ($a) => a == 42;

$boolean = Stream::of($answers)

->anyMatch($answers, $isUltimateAnswer);

// true


##### Are Permutations With
????????? ??????, ???? ????????? ?? ?????? ? ?????????? ????????? ???????? ?????????????? ???? ?????.


use IterTools\Summary;
$rite = ['r', 'i', 't', 'e'];
$reit = ['r', 'e', 'i', 't'];
$tier = ['t', 'i', 'e', 'r'];
$tire = ['t', 'i', 'r', 'e'];
$trie = ['t', 'r', 'i', 'e'];
$boolean = Stream::of(['i', 't', 'e', 'r'])
    ->arePermutationsWith($rite, $reit, $tier, $tire, $trie);
// true

Are Permutations Coercive With

????????? ??????, ???? ????????? ?? ?????? ? ?????????? ????????? ???????? ?????????????? ???? ????? (? ?????? ?????????? ?????).

use IterTools\Summary; $set2 = [2.0, '1', 3]; $set3 = [3, 2, 1]; $boolean = Stream::of([1, 2.0, '3'])

->arePermutationsCoerciveWith($set2, $set3);

// true


##### Exactly N
?????????? ??????, ???? ? ???????? ??? n ????????? ?? ?????? ???????? ?????????? ??????.

- ???????? ???????? ?????????????? ??????????.
- ?? ????????? (???? ?? ???????) ???????? ???????? ???????? ????????? ? `bool`.



use IterTools\Summary;

$twoTruthsAndALie = [true, true, false];
$n                = 2;

$boolean = Stream::of($twoTruthsAndALie)->exactlyN($n);
// true

Is Partitioned

?????????? ??????, ???? ??? ???????? ???????? ???????? ?? ?????? ????????? ? ????????? ????? ??????? (?????????? ?????????? ????????).

  • ?????????? ?????? ??? ?????? ????????? ? ??? ????????? ? ????? ?????????.
  • ???? ???????? ?? ??? ???????, ?????????? ???????? ?????????? ????? ?????????? ??? ???????? ? ???????? ????.

use IterTools\Summary; $numbers = [0, 2, 4, 1, 3, 5]; $evensBeforeOdds = fn ($item) => $item % 2 === 0; $boolean = Stream::($numbers)

->isPartitioned($evensBeforeOdds);

// true


##### Is Sorted
?????????? ??????, ???? ????????? ????????? ?? ?????? ????????????? ? ?????? ???????, ????? ? ????.

???????? ?????? ???? ????????.

??? ?????? ????????? ??? ????????? ?? ?????? ???????? ?????? ?????????? ??????.

use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($input)
    ->isSorted();
// true

$input = [1, 2, 3, 2, 1];

$result = Stream::of($input)
    ->isSorted();
// false

Is Reversed

?????????? ??????, ???? ????????? ????????? ?? ?????? ????????????? ? ???????? ???????, ????? ? ????.


???????? ?????? ???? ????????.

??? ?????? ????????? ??? ????????? ?? ?????? ???????? ?????? ?????????? ??????.

use IterTools\Stream;

$input = [5, 4, 3, 2, 1];

$result = Stream::of($input)

->isReversed();

// true

$input = [1, 2, 3, 2, 1];

$result = Stream::of($input)

->isReversed();

// false


##### None Match
?????????? ??????, ???? ??? ???? ????????? ?? ?????? ???????? ?????? ????.



use IterTools\Summary;

$grades         = [45, 50, 61, 0];
$isPassingGrade = fn ($grade) => $grade >= 70;

$boolean = Stream::of($grades)->noneMatch($isPassingGrade);
// true

Same With

?????????? ??????, ???? ????????? ????????? ?? ?????? ????????? ?????????? ? ?????????? ??????????.


???? ? ????? ?? ???????? ?? ????? ?????????, ?? ?????? ??????.

use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($input)

->sameWith([1, 2, 3, 4, 5]);

// true

$result = Stream::of($input)

->sameWith([5, 4, 3, 2, 1]);

// false


##### Same Count With
?????????? ??????, ???? ? ????????? ????????? ?? ??????, ? ??? ?????????? ????????? ????? ?????????? ?????.

???? ? ????? ?? ???????? ?? ????? ?????????, ?? ?????? ??????.

use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($input)
    ->sameCountWith([5, 4, 3, 2, 1]);
// true

$result = Stream::of($input)
    ->sameCountWith([1, 2, 3]);
// false

?????????????

To Average

?????????? ??????? ?????????????? ????????? ????????? ?? ??????.


??? ?????? ????????? ?????? `null`.

use IterTools\Stream;

$input = [2, 4, 6, 8];

$result = Stream::of($iterable)

->toAverage();

// 5


##### To Count
?????????? ????? ????????? ????????? ?? ??????.



use IterTools\Stream;

$input = [10, 20, 30, 40, 50];

$result = Stream::of($iterable)
    ->toCount();
// 5

To First

?????????? ?????? ??????? ?? ????????? ? ??????.


??????? `\LengthException` ???? ???????? ? ?????? ????????? ?????.

use IterTools\Stream;

$input = [10, 20, 30];

$result = Stream::of($input)

->toFirst();

// 10


##### To First And Last
?????????? ?????? ? ????????? ???????? ?? ????????? ? ??????.

??????? \LengthException ???? ???????? ? ?????? ????????? ?????.

use IterTools\Stream;

$input = [10, 20, 30];

$result = Stream::of($input)
    ->toFirstAndLast();
// [10, 30]

To Last

?????????? ????????? ??????? ?? ????????? ? ??????.


??????? `\LengthException` ???? ???????? ? ?????? ????????? ?????.

use IterTools\Stream;

$input = [10, 20, 30];

$result = Stream::of($input)

->toLast();

// 30


##### To Max
?????????? ???????????? ??????? ????????? ?? ??????.

  • ??????? `$compareBy` ?????? ?????????? ????????? ????????.
  • ???? ???????? `$compareBy` ?? ???????, ???????? ????????? ?????? ???? ????????.
  • ??? ?????? ????????? ?????? `null`. 
use IterTools\Stream;

$input = [1, -1, 2, -2, 3, -3];

$result = Stream::of($iterable)
    ->toMax();
// 3

To Min

?????????? ??????????? ??????? ????????? ?? ??????.


- ??????? `$compareBy` ?????? ?????????? ????????? ????????.
- ???? ???????? `$compareBy` ?? ???????, ???????? ????????? ?????? ???? ????????.
- ??? ?????? ????????? ?????? `null`.

use IterTools\Stream;

$input = [1, -1, 2, -2, 3, -3];

$result = Stream::of($iterable)

->toMin();

// -3


##### To Min Max
?????????? ??????????? ? ???????????? ???????? ????????? ?? ??????.

  • ??????? `$compareBy` ?????? ?????????? ????????? ????????.
  • ???? ???????? `$compareBy` ?? ???????, ???????? ????????? ?????? ???? ????????.
  • ??? ?????? ????????? ?????? `[null, null]`. 
use IterTools\Stream;

$numbers = [1, 2, 3, -1, -2, -3];

[$min, $max] = Stream::of($numbers)
    ->toMinMax();
// [-3, 3]

To Product

?????????? ???????????? ????????? ????????? ?? ??????.


??? ?????? ????????? ?????? `null`.

use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($iterable)

->toProduct();

// 120


##### To Range
?????????? ??????? ????? ???????????? ? ??????????? ?????????? ????????? ?? ??????.

??? ?????? ????????? ?????? 0.

use IterTools\Stream;

$grades = [100, 90, 80, 85, 95];

$range = Stream::of($numbers)
    ->toRange();
// 20

To String

??????????? ????????? ?? ?????? ? ??????, "????????" ?? ????????.

  • ???????? ??????????????? ????????? `$separator` ??????????? ? ???????? ??????????? ????? ?????????? ? ??????.
  • ???????? ??????????????? ????????? `$prefix` ??????????? ? ?????? ??????.
  • ???????? ??????????????? ????????? `$suffix` ??????????? ? ????? ??????.

use IterTools\Stream;

$words = ['IterTools', 'PHP', 'v1.0'];

$string = Stream::of($words)->toString($words); // IterToolsPHPv1.0 $string = Stream::of($words)->toString($words, '-'); // IterTools-PHP-v1.0 $string = Stream::of($words)->toString($words, '-', 'Library: '); // Library: IterTools-PHP-v1.0 $string = Stream::of($words)->toString($words, '-', 'Library: ', '!'); // Library: IterTools-PHP-v1.0!


##### To Sum
?????????? ????? ????????? ????????? ?? ??????.



use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($iterable)
    ->toSum();
// 15

To Value

?????????? ????????? ?? ?????? ?? ????????, ???????????? ? ?????????????? callback-???????.

? ??????? ?? array_reduce(), ???????? ? ?????? iterable ??????.

use IterTools\Stream;

$input = [1, 2, 3, 4, 5];

$result = Stream::of($iterable)

->toValue(fn ($carry, $item) => $carry + $item);

// 15


#### ???????? ???????????

##### To Array
?????????? ?????? ???? ????????? ?? ??????.



use IterTools\Stream;

$array = Stream::of([1, 1, 2, 2, 3, 4, 5])
    ->distinct()
    ->map(fn ($x) => $x2)
    ->toArray();
// [1, 4, 9, 16, 25]

To Associative Array

?????????? ????????????? ?????? ???? ????????? ?? ??????.

use IterTools\Stream; $keyFunc $array = Stream::of(['message 1', 'message 2', 'message 3'])

->map('strtoupper')
->toAssociativeArray(
    fn ($s) => \md5($s),
    fn ($s) => $s
);

// [3b3f2272b3b904d342b2d0df2bf31ed4 => MESSAGE 1, 43638d919cfb8ea31979880f1a2bb146 => MESSAGE 2, ... ]


##### Tee
??????? ????????? ?????????? ??????????? ??????? ?? ???????.


use IterTools\Transform;
$daysOfWeek = ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat', 'Sun'];
$count = 3;
[$week1Stream, $week2Stream, $week3Stream] = Stream::of($daysOfWeek)
    ->tee($count);
// Each $weekStream contains ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat', 'Sun']

???????? ? ????????? ?????????

Call For Each

???????? callback-??????? ??? ??????? ???????? ?? ??????.

use IterTools\Stream;

$languages = ['PHP', 'Python', 'Java', 'Go']; $mascots = ['elephant', 'snake', 'bean', 'gopher'];

$zipPrinter = fn ($zipped) => print("{$zipped[0]}'s mascot: {$zipped[1]}");

Stream::of($languages)

->zipWith($mascots)
->callForEach($zipPrinter);

// PHP's mascot: elephant // Python's mascot: snake // ...


##### Print
???????? `print()` ??? ??????? ???????? ?? ??????.

* ???????? ? ?????? ?????? ????? ????????? ?????????????.



use IterTools\Stream;

$words = ['IterTools', 'PHP', 'v1.0'];

Stream::of($words)->print();                       // IterToolsPHPv1.0
Stream::of($words)->print('-');                    // IterTools-PHP-v1.0
Stream::of($words)->print('-', 'Library: ');       // Library: IterTools-PHP-v1.0
Stream::of($words)->print('-', 'Library: ', '!');  // Library: IterTools-PHP-v1.0!

Print Line

???????? ???????? ?? ?????? ?????? ? ????? ??????.

  • ???????? ? ?????? ?????? ????? ????????? ?????????????.

use IterTools\Stream;

$words = ['IterTools', 'PHP', 'v1.0'];

Stream::of($words)->printLn(); // IterTools // PHP // v1.0


##### Print R
???????? `print_r()` ??? ??????? ???????? ?? ??????.



use IterTools\Stream;

$items = [$string, $array, $object];

Stream::of($words)->printR();
// print_r output

To CSV File

?????????? ?????????? ?????? ? CSV ????.

use IterTools\Stream; $starWarsMovies = [

['Star Wars: Episode IV ? A New Hope', 'IV', 1977],
['Star Wars: Episode V ? The Empire Strikes Back', 'V', 1980],
['Star Wars: Episode VI ? Return of the Jedi', 'VI', 1983],

]; $header = ['title', 'episode', 'year']; Stream::of($data)

->toCsvFile($fh, $header);

// title,episode,year // "Star Wars: Episode IV ? A New Hope",IV,1977 // "Star Wars: Episode V ? The Empire Strikes Back",V,1980 // "Star Wars: Episode VI ? Return of the Jedi",VI,1983


##### To File
?????????? ?????????? ?????? ? ????.



use IterTools\Stream;
$data = ['item1', 'item2', 'item3'];
$header = '<ul>';
$footer = '</ul>';
Stream::of($data)
    ->map(fn ($item) => "  <li>$item</li>")
    ->toFile($fh, \PHP_EOL, $header, $footer);
// <ul>
//   <li>item1</li>
//   <li>item2</li>
//   <li>item3</li>
// </ul>

Var Dump

???????? var_dump() ??? ??????? ???????? ?? ??????.

use IterTools\Stream;

$items = [$string, $array, $object];

Stream::of($words)->varDump(); // var_dump output


## ?????????? ???????
IterTools ????????? ????????????? ?????? ???????, ????? ???????? ????? ?????????.

#### Zip Strings

use IterTools\Multi; use IterTools\Single;

$letters = 'ABCDEFGHI'; $numbers = '123456789';

foreach (Multi::zip(Single::string($letters), Single::string($numbers)) as [$letter, $number]) {

 $battleshipMove = new BattleshipMove($letter, $number)

} // A1, B2, C3


#### Chain Strings

use IterTools\Multi; use IterTools\Single;

$letters = 'abc'; $numbers = '123';

foreach (Multi::chain(Single::string($letters), Single::string($numbers)) as $character) {

print($character);

} // a, b, c, 1, 2, 3


## ?????? ?????????

??? ???????, ??????? ?????????? ????????? ????????? ????????? ??? ????????? ??????????,
?? ????????? ????????? ??????????? ?????? ??? ?????????? ?????:

* scalars: ?????????? ?????? ?? ????;
* objects: ?????? ??????? ?????? ?????????? ?????????;
* arrays: ?????????? ????????????????.

? ??????, ???? ????? ??????????? ???????????? ????? ?????????? ????? (????? ???????? `$strict`) ??? `$strict` ????????????? ? `false`
???? ???? ????? ????? ? ???????? ????? `Coercive`, ?? ????? ???????? ? ????????? ?????? ?????????:

* scalars: ?????????? ???????? ?? ????????;
* objects: ?????????? ????????????????;
* arrays: ?????????? ????????????????.

?????????
---------

IterTools PHP ????????????? ????????? ??????????:

* PSR-1  - Basic coding standard (http://www.php-fig.org/psr/psr-1/)
* PSR-4  - Autoloader (http://www.php-fig.org/psr/psr-4/)
* PSR-12 - Extended coding style guide (http://www.php-fig.org/psr/psr-12/)

????????
-------

IterTools PHP ???????????????? ?? ???????? MIT License.