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<?php declare(strict_types=1); namespace Psl\Vec; /** * Takes a slice from an iterable. * * Examples: * * Vec\slice([-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5], 5) * => Vec(0, 1, 2, 3, 4, 5) * * Vec\slice([-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5], 5, 3) * => Vec(0, 1, 2) * * @template T * * @param iterable<T> $iterable Iterable to take the slice from * @param int<0, max> $start Start offset * @param null|int<0, max> $length Length (if not specified all remaining values from the array are used) * * @return list<T> */ function slice(iterable $iterable, int $start, ?int $length = null): array { $result = []; if (0 === $length) { return $result; } $i = 0; foreach ($iterable as $value) { if ($i++ < $start) { continue; } $result[] = $value; if (null !== $length && $i >= $start + $length) { break; } } return $result; }