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<?php declare(strict_types=1); namespace Psl\Dict; /** * Takes a slice from an iterable. * * Examples: * * Dict\slice(['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4], 2) * => Dict('c' => 3, 'd' => 4) * * Dict\slice(['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4], 1, 2) * => Dict('b' => 2, 'c' => 3) * * @template Tk of array-key * @template Tv * * @param iterable<Tk, Tv> $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 array<Tk, Tv> */ function slice(iterable $iterable, int $start, ?int $length = null): array { $result = []; if (0 === $length) { return $result; } $i = 0; foreach ($iterable as $key => $value) { if ($i++ < $start) { continue; } $result[$key] = $value; if (null !== $length && $i >= $start + $length) { break; } } return $result; }
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