ConstMap::takeWhile

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

Description

public function takeWhile(
  callable $fn,
): ConstMap<Tk,Tv>

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

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

Parameters

  • callable $fn - The callback that is used to determine the stopping condition.

Return Values