test/built-ins/Array/prototype/reduce/15.4.4.21-7-6.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.

/*---
es5id: 15.4.4.21-7-6
description: >
    Array.prototype.reduce returns initialValue if 'length' is 0 and
    initialValue is present (subclassed Array, length overridden with
    obj with valueOf)
---*/

  foo.prototype = new Array(1, 2, 3);
  function foo() {}
  var f = new foo();
  
  var o = { valueOf: function () { return 0;}};
  f.length = o;
  
  function cb(){}
assert.sameValue(f.reduce(cb,1), 1, 'f.reduce(cb,1)');