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// Copyright (c) 2012 Ecma International. All rights reserved.
// Ecma International makes this code available under the terms and conditions set
// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the
// "Use Terms"). Any redistribution of this code must retain the above
// copyright and this notice and otherwise comply with the Use Terms.
/*---
es5id: 15.4.4.19-9-12
description: >
Array.prototype.map - returns an empty array if 'length' is 0
(subclassed Array, length overridden with [])
includes: [runTestCase.js]
---*/
function testcase() {
function Foo() { }
Foo.prototype = [1, 2, 3];
var f = new Foo();
f.length = [];
// 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.
//
// The toString( ) method on Array converts the array elements to strings,
// then returns the result of concatenating these strings, with commas in
// between. An array with no elements converts to the empty string, which
// converts to the number 0. If an array has a single element that is a
// number n, the array converts to a string representation of n, which is
// then converted back to n itself. If an array contains more than one element,
// or if its one element is not a number, the array converts to NaN.
function cb() { }
var a = Array.prototype.map.call(f, cb);
if (Array.isArray(a) && a.length === 0) {
return true;
}
}
runTestCase(testcase);
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