HH\Set::filter

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

public function filter(
  (function(Tv):bool) $callback,
): Set<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().

Parameters

• (function(Tv):bool) $callback - The callback containing the condition to apply to the current Set values.

Return Values

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