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<?php declare(strict_types=1); namespace Psl\Dict; use Closure; /** * Re-indexes an iterable by applying a function to all its values and * using the returned value as the new key/index. * * The function is passed the current iterable value and should return a new * key for that element. The value is left as-is. The original key is not passed * to the mapping function. * * Examples: * * $users = [ * ['id' => 42, 'name' => 'foo'], * ['id' => 24, 'name' => 'bar'] * ]; * * Dict\reindex($users, fn($user) => $user['id']) * => Dict( * 42 => ['id' => 42, 'name' => 'foo'], * 24 => ['id' => 24, 'name' => 'bar'] * ) * * @template Tk1 * @template Tk2 of array-key * @template Tv * * @param iterable<Tk1, Tv> $iterable Iterable to reindex * @param (Closure(Tv): Tk2) $function * * @return array<Tk2, Tv> */ function reindex(iterable $iterable, Closure $function): array { $result = []; foreach ($iterable as $value) { $result[$function($value)] = $value; } return $result; }
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