src/dstr-binding/obj-ptrn-id-init-skipped.case

// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
desc: Destructuring initializer is not evaluated when value is not `undefined`
template: default
info: |
    13.3.3.7 Runtime Semantics: KeyedBindingInitialization

    SingleNameBinding : BindingIdentifier Initializeropt

    [...]
    6. If Initializer is present and v is undefined, then
       [...]
    [...]
---*/

//- setup
var initCount = 0;
function counter() {
  initCount += 1;
}
//- elems
{ w = counter(), x = counter(), y = counter(), z = counter() }
//- vals
{ w: null, x: 0, y: false, z: '' }
//- body
assert.sameValue(w, null);
assert.sameValue(x, 0);
assert.sameValue(y, false);
assert.sameValue(z, '');
assert.sameValue(initCount, 0);