js/src/tests/test262/built-ins/Array/prototype/reduce/15.4.4.21-9-b-24.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.reduce
description: >
    Array.prototype.reduce - deleting property of prototype causes
    deleted index property not to be visited on an Array
---*/

var accessed = false;
var testResult = true;

function callbackfn(accum, val, idx, obj) {
  accessed = true;
  if (idx === 1) {
    testResult = false;
  }
}

var arr = [0, , , 3];
Object.defineProperty(arr, "0", {
  get: function() {
    delete Array.prototype[1];
    return 0;
  },
  configurable: true
});

Array.prototype[1] = 1;
arr.reduce(callbackfn, "initialValue");

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

reportCompare(0, 0);