HH\Pair::keys

Returns an ImmVector with the values being the keys of the current Pair.

Description

public function keys(): ImmVector<int>

Returns an ImmVector with the values being the keys of the current Pair.

This method will return an ImmVector with keys 0 and 1, and values 0 and 1, since the keys of a Pair are 0 and 1.

Return Values

Examples

<?hh

namespace Hack\UserDocumentation\API\Examples\Pair\Keys;

$p = Pair {'foo', -1.5};
var_dump($p->keys());
Output
object(HH\ImmVector)#2 (2) {
  [0]=>
  int(0)
  [1]=>
  int(1)
}