HH\Lib\Keyset\partition

This API is part of the Hack Standard Library, not HHVM itself.
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This function is available as Keyset\partition() in Facebook's www repository.

Returns a 2-tuple containing keysets for which the given predicate returned true and false, respectively

Description

namespace HH\Lib\Keyset;

function partition<Tv as arraykey>(
  Traversable<Tv> $traversable,
  (function(Tv):bool) $predicate,
): (keyset<Tv>,keyset<Tv>);

Parameters