JSTests/test262/test/language/statements/const/dstr/obj-ptrn-prop-id-init-skipped.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/obj-ptrn-prop-id-init-skipped.case
// - src/dstr-binding/default/const-stmt.template
/*---
description: Destructuring initializer is not evaluated when value is not `undefined` (`const` statement)
esid: sec-let-and-const-declarations-runtime-semantics-evaluation
features: [destructuring-binding]
flags: [generated]
info: |
    LexicalBinding : BindingPattern Initializer

    1. Let rhs be the result of evaluating Initializer.
    2. Let value be GetValue(rhs).
    3. ReturnIfAbrupt(value).
    4. Let env be the running execution context's LexicalEnvironment.
    5. Return the result of performing BindingInitialization for BindingPattern
       using value and env as the arguments.

    13.3.3.7 Runtime Semantics: KeyedBindingInitialization

    BindingElement : BindingPattern Initializeropt

    [...]
    3. If Initializer is present and v is undefined, then
    [...]
---*/
var initCount = 0;
function counter() {
  initCount += 1;
}

const { s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } = { s: null, u: 0, w: false, y: '' };

assert.sameValue(t, null);
assert.sameValue(v, 0);
assert.sameValue(x, false);
assert.sameValue(z, '');
assert.sameValue(initCount, 0);

assert.throws(ReferenceError, function() {
  s;
});
assert.throws(ReferenceError, function() {
  u;
});
assert.throws(ReferenceError, function() {
  w;
});
assert.throws(ReferenceError, function() {
  y;
});