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<?php declare(strict_types=1); namespace Psl\Dict; use Closure; /** * Applies a mapping function to all keys of an iterable. * * The function is passed the current iterable key and should return a * modified key. * * The value is left as-is and not passed to the mapping function. * * Examples: * * Dict\map_keys([0 => 1, 1 => 2, 2 => 3, 3 => 4, 4 => 5], fn($i) => $i * 2); * => Dict(0 => 1, 2 => 2, 4 => 3, 6 => 4, 8 => 5) * * @template Tk1 of array-key * @template Tk2 of array-key * @template Tv * * @param iterable<Tk1, Tv> $iterable Iterable to be mapped over * @param (Closure(Tk1): Tk2) $function * * @return ($iterable is non-empty-array ? non-empty-array<Tk2, Tv> : array<Tk2, Tv>) */ function map_keys(iterable $iterable, Closure $function): array { $result = []; foreach ($iterable as $key => $value) { $result[$function($key)] = $value; } return $result; }
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