HH\Lib\Vec\keys

Requires the Hack Standard Library to be installed.

Facebook Engineer?

This function is available as Vec\keys() in Facebook's www repository.

Returns a new vec containing the keys of the given KeyedTraversable

namespace HH\Lib\Vec;

function keys<Tk, Tv>(
  KeyedTraversable<Tk, Tv> $traversable,
): vec<Tk>;

Time complexity: O(n) Space complexity: O(n)

Parameters