test/built-ins/Array/prototype/reduce/15.4.4.21-5-4.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: 15.4.4.21-5-4
description: >
    Array.prototype.reduce throws TypeError if 'length' is 0
    (subclassed Array, length overridden to 0 (type conversion)), no
    initVal
---*/

foo.prototype = new Array(1, 2, 3);

function foo() {}
var f = new foo();
f.length = 0;

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