test/built-ins/Array/prototype/reduce/15.4.4.21-7-2.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: 15.4.4.21-7-2
description: >
    Array.prototype.reduce returns initialValue if 'length' is 0 and
    initialValue is present (subclassed Array, length overridden to
    null (type conversion))
---*/

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

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

function cb() {}
assert.sameValue(f.reduce(cb, 1), 1, 'f.reduce(cb,1)');