HH\Map::takeWhile

Returns a Map containing the keys and values of the current Map up to but not including the first value that produces false when passed to the specified callback

public function takeWhile(
  (function(Tv):bool) $callback,
): Map<Tk, Tv>;

The returned Map will always be a proper subset of the current Map.

Parameters

  • (function(Tv):bool) $callback

Return Values

  • Map<Tk, Tv> - A Map that is a proper subset of the current Map up until the callback returns false.