| // 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'); |
