| // Copyright 2018 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // indexOf |
| |
| /* Test behaviors when the prototype has elements */ |
| |
| (function() { |
| const iarr = [,3]; |
| |
| function indexOf(arr, val) { |
| return arr.indexOf(val); |
| } |
| |
| assertEquals(-1, indexOf(iarr, 2)); |
| assertEquals(1, indexOf(iarr, 3)); |
| |
| iarr.__proto__ = [2]; |
| assertEquals(0, indexOf(iarr, 2)); |
| })(); |
| |
| // This pollutes the Array prototype, so we should not run more tests |
| // in the same environment after this. |
| (function () { |
| var array = [,]; |
| |
| function indexOf(val) { |
| return array.indexOf(val); |
| } |
| |
| assertEquals(indexOf(6), -1); |
| |
| array.__proto__.push(6); |
| assertEquals(indexOf(6), 0); |
| })(); |