Language/Expressions/Method_Invocation/Ordinary_Invocation/conditional_t04.dart

// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion Evaluation of a conditional ordinary method invocation e of the
/// form o?.m(a1, ..., an, xn+1 : an+1, ..., xn+k : an+k)
/// is equivalent to the evaluation of the expression
/// ((x) => x == null?null : x.m(a1, ..., an, xn+1 : an+1, ..., xn+k : an+k))(o).
/// unless o is a type literal, in which case it is equivalent to
/// o.m(a1, ..., an, xn+1 : an+1, ..., xn+k : an+k).
/// @description Check that e1?.id is equivalent to
/// ((x) => x == null?null : x.id)(e1). Test conditional invocation of the
/// method with parameters
/// @author sgrekhov@unipro.ru

import '../../../../Utils/expect.dart';

class A {
  String m1(String p) => "A" + p;
}

class C extends A {
  String m2(String p, [String? p2]) => "C" + p;
}

main() {
  var c1 = new C() as C?;
  C? c2 = null;
  Expect.equals("A1", c1?.m1("1"));
  Expect.equals("C2", c1?.m2("2", "3"));

  Expect.isNull(c2?.m1("1"));
  Expect.isNull(c2?.m2("2"));
}