blob: 9a5dab55a835c85db0a6ef03b5a6ebd2724588dd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
// 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.map
description: >
Array.prototype.map - returns an empty array if 'length' is 0
(subclassed Array, length overridden with obj w/o valueOf
(toString))
---*/
function Foo() {}
Foo.prototype = [1, 2, 3];
var f = new Foo();
var o = {
toString: function() {
return '0';
}
};
f.length = o;
// objects inherit the default valueOf method of the Object object;
// that simply returns the itself. Since the default valueOf() method
// does not return a primitive value, ES next tries to convert the object
// to a number by calling its toString() method and converting the
// resulting string to a number.
function cb() {}
var a = Array.prototype.map.call(f, cb);
assert(Array.isArray(a), 'Array.isArray(a) !== true');
assert.sameValue(a.length, 0, 'a.length');
reportCompare(0, 0);
|