map

If this is a success, applies the function to the value and returns a new Result. If this is an error, returns the error unchanged.

Example:

    var r = Result.ok<string,string> ("hello");
    var mapped = r.map<string> ((s) => { return s.up (); });
    assert (mapped.unwrap () == "HELLO");

Parameters:

func	the transformation function.

Returns:

a new Result with the transformed value.