Returns an ImmMap after an operation has been applied to each value in the current ImmMap

public function map<Tu>(
  (function(Tv):Tu) $callback,
): ImmMap<Tk, Tu>;

Every value in the current ImmMap is affected by a call to map(), unlike filter() where only values that meet a certain criteria are affected.

The keys will remain unchanged from this ImmMap to the returned ImmMap.


  • (function(Tv):Tu) $callback - The callback containing the operation to apply to the current ImmMap values.

Return Values

  • ImmMap<Tk, Tu> - an ImmMap containing key/value pairs after a user-specified operation is applied.