HH\ImmSet::takeWhile

Returns an ImmSet containing the values of the current ImmSet 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,
): ImmSet<Tv>

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

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

Parameters

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

Return Values

Examples

See Set::takeWhile for usage examples.