test/built-ins/Array/prototype/reduce/15.4.4.21-5-2.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
es5id: 15.4.4.21-5-2
description: >
    Array.prototype.reduce throws TypeError if 'length' is 0
    (subclassed Array, length overridden to null (type conversion)),
    no initVal
---*/

  foo.prototype = new Array(1, 2, 3);
  function foo() {}
  var f = new foo();
  f.length = null;

  function cb(){}
assert.throws(TypeError, function() {
    f.reduce(cb);
});