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<?php declare(strict_types=1); namespace Psl\Dict; use Closure; use Psl\Iter; /** * Returns a new array in which each value appears exactly once, where the * value's uniqueness is determined by transforming it to a scalar via the * given function. * * @template Tk of array-key * @template Tv * @template Ts * * @param iterable<Tk, Tv> $iterable * @param (Closure(Tv): Ts) $scalar_func * * @return array<Tk, Tv> */ function unique_by(iterable $iterable, Closure $scalar_func): array { /** @var array<Tk, Ts> $unique */ $unique = []; /** @var array<Tk, Tv> $original_values */ $original_values = []; foreach ($iterable as $k => $v) { $original_values[$k] = $v; $scalar = $scalar_func($v); if (!Iter\contains($unique, $scalar)) { $unique[$k] = $scalar; } } /** @var array<Tk, Tv> $result */ $result = []; foreach ($unique as $k => $_) { $result[$k] = $original_values[$k]; } return $result; }
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