// 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.lastindexof description: > Array.prototype.lastIndexOf - value of 'fromIndex' which is an Object, and has an own toString method ---*/ // objects inherit the default valueOf() method from Object // that simply returns 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. var fromIndex = { toString: function() { return '2'; } }; var targetObj = new RegExp(); assert.sameValue([0, true, targetObj, 3, false].lastIndexOf(targetObj, fromIndex), 2, '[0, true, targetObj, 3, false].lastIndexOf(targetObj, fromIndex)'); assert.sameValue([0, true, 3, targetObj, false].lastIndexOf(targetObj, fromIndex), -1, '[0, true, 3, targetObj, false].lastIndexOf(targetObj, fromIndex)'); reportCompare(0, 0);