test/built-ins/Array/prototype/forEach/15.4.4.18-7-b-16.js


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// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-array.prototype.foreach
es5id: 15.4.4.18-7-b-16
description: >
    Array.prototype.forEach - decreasing length of array does not
    delete non-configurable properties
flags: [noStrict]
---*/

var testResult = false;

function callbackfn(val, idx, obj) {
  if (idx === 2 && val === "unconfigurable") {
    testResult = true;
  }
}

var arr = [0, 1, 2];

Object.defineProperty(arr, "2", {
  get: function() {
    return "unconfigurable";
  },
  configurable: false
});

Object.defineProperty(arr, "1", {
  get: function() {
    arr.length = 2;
    return 1;
  },
  configurable: true
});

arr.forEach(callbackfn);

assert(testResult, 'testResult !== true');