HH\ImmMap::takeWhile

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

Description

public function takeWhile(
  (function(Tv):bool) $fn,
): ImmMap<Tk,Tv>

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

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

Parameters

  • (function(Tv):bool) $fn - The callback that is used to determine the stopping condition.

Return Values

Examples

See Map::takeWhile for usage examples.