HH\ImmSet::filter

Returns an ImmSet containing the values of the current ImmSet that meet a supplied condition applied to each value

public function filter(
  (function(Tv): bool) $callback,
): ImmSet<Tv>;

Only values that meet a certain criteria are affected by a call to filter(), while all values are affected by a call to map().

Guide

• Examples

Parameters

• (function(Tv): bool) $callback

Returns

• ImmSet<Tv> - an ImmSet containing the values after a user-specified condition is applied.

Examples

See [Set::filter](</hack/reference/class/Set/filter/#examples>) for usage examples.