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<?php |
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namespace Smoren\Sequence\Functions; |
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use ArrayIterator; |
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use IteratorIterator; |
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use MultipleIterator; |
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use Smoren\Sequence\Structs\IndexedArray; |
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use Smoren\Sequence\Structs\Range; |
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/** |
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* Creates iterable range. |
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* |
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* @param int $start start value |
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* @param int<0, max>|null $size size of elements |
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* @param int $step range step |
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* |
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* @return Range<int> iterable range |
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*/ |
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function xrange(int $start, ?int $size = null, int $step = 1): Range |
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{ |
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if ($size === null) { |
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[$start, $size] = [0, $start]; |
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} |
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return new Range($start, $size, $step); |
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} |
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/** |
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* Maps iterable collections and returns IndexedArray of mapped values. |
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* |
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* @template TInput |
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* @template TOutput |
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* |
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* @param callable(TInput $item): TOutput $mapper |
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* @param iterable<TInput> $collections |
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* |
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* @return IndexedArray<TOutput> |
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*/ |
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function map(callable $mapper, iterable ...$collections): IndexedArray |
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{ |
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$result = new IndexedArray(); |
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if (count($collections) === 0) { |
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return $result; |
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} |
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$it = new MultipleIterator(MultipleIterator::MIT_NEED_ALL | MultipleIterator::MIT_KEYS_NUMERIC); |
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foreach ($collections as $collection) { |
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if (is_array($collection)) { |
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$collection = new ArrayIterator($collection); |
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} |
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$it->attachIterator(new IteratorIterator($collection)); |
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} |
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foreach ($it as $values) { |
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$result[] = $mapper(...$values); |
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} |
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return $result; |
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} |
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/** |
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* Filters iterable collection and returns IndexedArray of filtered items. |
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* |
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* @template T |
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* |
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* @param iterable<T> $collection |
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* @param callable(T $item): bool $filter |
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* |
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* @return IndexedArray<T> |
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*/ |
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function filter(iterable $collection, callable $filter): IndexedArray |
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{ |
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$result = new IndexedArray(); |
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foreach ($collection as $item) { |
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if ($filter($item)) { |
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$result[] = $item; |
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} |
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} |
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return $result; |
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} |
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/** |
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* Reduces iterable collection. |
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* |
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* @template TInput |
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* @template TOutput |
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* |
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* @param iterable<TInput> $collection |
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* @param callable(TOutput $carry, TInput $item): TOutput $reducer |
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* @param TOutput $initialValue |
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* |
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* @return TOutput |
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*/ |
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function reduce(iterable $collection, callable $reducer, $initialValue = null) |
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{ |
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$carry = $initialValue; |
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foreach ($collection as $item) { |
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$carry = $reducer($carry, $item); |
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} |
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return $carry; |
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} |
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Smoren /
sequence-php
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