Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | var typedArrayConstructors = [ |
| 6 | Uint8Array, |
| 7 | Int8Array, |
| 8 | Uint16Array, |
| 9 | Int16Array, |
| 10 | Uint32Array, |
| 11 | Int32Array, |
| 12 | Uint8ClampedArray, |
| 13 | Float32Array, |
| 14 | Float64Array |
| 15 | ]; |
| 16 | |
| 17 | for (var constructor of typedArrayConstructors) { |
| 18 | // Check various variants of empty array's slicing. |
| 19 | var array = new constructor(0); |
| 20 | for (var i = 0; i < 7; i++) { |
| 21 | assertEquals(0, array.slice(0, 0).length); |
| 22 | assertEquals(0, array.slice(1, 0).length); |
| 23 | assertEquals(0, array.slice(0, 1).length); |
| 24 | assertEquals(0, array.slice(-1, 0).length); |
| 25 | } |
| 26 | |
| 27 | |
| 28 | // Check various forms of arguments omission. |
| 29 | array = new constructor(7); |
| 30 | |
| 31 | for (var i = 0; i < 7; i++) { |
| 32 | assertEquals(array, array.slice()); |
| 33 | assertEquals(array, array.slice(0)); |
| 34 | assertEquals(array, array.slice(undefined)); |
| 35 | assertEquals(array, array.slice("foobar")); |
| 36 | assertEquals(array, array.slice(undefined, undefined)); |
| 37 | } |
| 38 | |
| 39 | |
| 40 | // Check variants of negatives and positive indices. |
| 41 | array = new constructor(7); |
| 42 | |
| 43 | assertEquals(7, array.slice(-100).length); |
| 44 | assertEquals(3, array.slice(-3).length); |
| 45 | assertEquals(3, array.slice(4).length); |
| 46 | assertEquals(1, array.slice(6).length); |
| 47 | assertEquals(0, array.slice(7).length); |
| 48 | assertEquals(0, array.slice(8).length); |
| 49 | assertEquals(0, array.slice(100).length); |
| 50 | |
| 51 | assertEquals(0, array.slice(0, -100).length); |
| 52 | assertEquals(4, array.slice(0, -3).length); |
| 53 | assertEquals(4, array.slice(0, 4).length); |
| 54 | assertEquals(6, array.slice(0, 6).length); |
| 55 | assertEquals(7, array.slice(0, 7).length); |
| 56 | assertEquals(7, array.slice(0, 8).length); |
| 57 | assertEquals(7, array.slice(0, 100).length); |
| 58 | |
| 59 | // Does not permit being called on other types |
| 60 | assertThrows(function () { |
| 61 | constructor.prototype.slice.call([], 0, 0); |
| 62 | }, TypeError); |
| 63 | |
| 64 | // Check that elements are copied properly in slice |
| 65 | array = new constructor([1, 2, 3, 4]); |
| 66 | var slice = array.slice(1, 3); |
| 67 | assertEquals(2, slice.length); |
| 68 | assertEquals(2, slice[0]); |
| 69 | assertEquals(3, slice[1]); |
| 70 | assertTrue(slice instanceof constructor); |
| 71 | } |