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<?php |
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declare(strict_types=1); |
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namespace loophp\collection\Operation; |
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use ArrayIterator; |
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use Closure; |
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use Generator; |
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use InfiniteIterator; |
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use loophp\iterators\ConcatIterableAggregate; |
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/** |
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* @immutable |
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* |
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* @template TKey |
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* @template T |
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*/ |
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final class Intersperse extends AbstractOperation |
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{ |
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/** |
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* @return Closure(T): Closure(int): Closure(int): Closure(iterable<TKey, T>): Generator<int|TKey, T> |
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*/ |
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public function __invoke(): Closure |
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{ |
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return |
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/** |
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* @param T $element |
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* |
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* @return Closure(int): Closure(int): Closure(iterable<TKey, T>): Generator<int|TKey, T> |
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*/ |
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static fn (mixed $element): Closure => |
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/** |
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* @return Closure(int): Closure(iterable<TKey, T>): Generator<int|TKey, T> |
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*/ |
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static fn (int $atEvery): Closure => |
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/** |
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* @return Closure(iterable<TKey, T>): Generator<int|TKey, T> |
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*/ |
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static fn (int $startAt): Closure => |
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/** |
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* @param iterable<TKey, T> $iterable |
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* |
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* @return Generator<int|TKey, T> |
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*/ |
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static function (iterable $iterable) use ($element, $atEvery, $startAt): Generator { |
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$intersperse = (new ConcatIterableAggregate([ |
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new ArrayIterator(array_fill(0, $startAt, 1)), |
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new InfiniteIterator(new ArrayIterator(range(0, $atEvery - 1))), |
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]))->getIterator(); |
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foreach ($iterable as $key => $value) { |
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if (0 === $intersperse->current()) { |
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yield $element; |
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} |
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yield $key => $value; |
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$intersperse->next(); |
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} |
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}; |
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} |
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} |
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loophp /
collection
