test/built-ins/Array/prototype/reduce/15.4.4.21-5-5.js


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

// 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: 15.4.4.21-5-5
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);
});