HH\Lib\Vec\unique

Requires the Hack Standard Library to be installed.

Facebook Engineer?

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

Returns a new vec containing each element of the given Traversable exactly once

namespace HH\Lib\Vec;

function unique<Tv as arraykey>(
  Traversable<Tv> $traversable,
): vec<Tv>;

The Traversable must contain arraykey values, and strict equality will be used.

For non-arraykey elements, see Vec\unique_by().

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

Parameters