test/built-ins/Array/prototype/lastIndexOf/15.4.4.15-3-23.js


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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: 15.4.4.15-3-23
description: >
    Array.prototype.lastIndexOf uses inherited valueOf method when
    'length' is an object with an own toString and an inherited
    valueOf methods
includes: [runTestCase.js]
---*/

function testcase() {

        var toStringAccessed = false;
        var valueOfAccessed = false;

        var proto = {
            valueOf: function () {
                valueOfAccessed = true;
                return 2;
            }
        };

        var Con = function () {};
        Con.prototype = proto;

        var child = new Con();
        child.toString = function () {
            toStringAccessed = true;
            return 2;
        };

        var obj = {
            1: child,
            length: child
        };

        return Array.prototype.lastIndexOf.call(obj, child) === 1 && valueOfAccessed && !toStringAccessed;
    }
runTestCase(testcase);