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<?php declare(strict_types=1); namespace Psl\Dict; use Closure; use function array_filter; use function is_array; /** * Returns a dict containing only the values for which the given predicate * returns `true`. * * The default predicate is casting the value to boolean. * * Example: * * Dict\filter(['', '0', 'a', 'b']) * => Dict(2 => 'a', 3 => 'b') * * Dict\filter(['foo', 'bar', 'baz', 'qux'], fn(string $value): bool => Str\contains($value, 'a')); * => Dict(1 => 'bar', 2 => 'baz') * * @template Tk of array-key * @template Tv * * @param iterable<Tk, Tv> $iterable * @param (Closure(Tv): bool)|null $predicate * * @return array<Tk, Tv> */ function filter(iterable $iterable, ?Closure $predicate = null): array { /** @var (Closure(Tv): bool) $predicate */ $predicate = $predicate ?? static fn(mixed $value): bool => (bool) $value; if (is_array($iterable)) { return array_filter( $iterable, /** * @param Tv $v */ static fn(mixed $v): bool => $predicate($v) ); } $result = []; foreach ($iterable as $k => $v) { if ($predicate($v)) { $result[$k] = $v; } } return $result; }
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