HH\Lib\Vec\filter

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This is available as Vec\filter in the www repository.

Returns a new vec containing only the values for which the given predicate returns true

namespace HH\Lib\Vec;

function filter<Tv>(
  Traversable<Tv> $traversable,
  ?(function(Tv): bool) $value_predicate = NULL,
): vec<Tv>;

The default predicate is casting the value to boolean.

Time complexity: O(n * p), where p is the complexity of $value_predicate Space complexity: O(n)

Parameters

  • Traversable<Tv>$traversable
  • ?(function(Tv): bool) $value_predicate = NULL

Returns

  • vec<Tv>

Examples

$numbers = vec[1, 2, 3, 4, 5];
$filter_numbers = Vec\filter($numbers, $number ==> $number % 2 === 0);
echo "Filter numbers are: \n";
\print_r($filter_numbers);
//Output: Filter numbers are:
//vec[2, 4]