Returns a KeyedIterable containing the values of the current KeyedIterable that meet a supplied condition


public function filter(
  (function(Tv):bool) $fn,
): KeyedIterable<Tk, 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().


  • $fn - The callback containing the condition to apply to the KeyedItearble values.

Return Values