Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2014 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 | (function testRestIndex() { |
| 6 | assertEquals(5, ((...args) => args.length)(1,2,3,4,5)); |
| 7 | assertEquals(4, ((a, ...args) => args.length)(1,2,3,4,5)); |
| 8 | assertEquals(3, ((a, b, ...args) => args.length)(1,2,3,4,5)); |
| 9 | assertEquals(2, ((a, b, c, ...args) => args.length)(1,2,3,4,5)); |
| 10 | assertEquals(1, ((a, b, c, d, ...args) => args.length)(1,2,3,4,5)); |
| 11 | assertEquals(0, ((a, b, c, d, e, ...args) => args.length)(1,2,3,4,5)); |
| 12 | })(); |
| 13 | |
| 14 | // strictTest and sloppyTest should be called with descending natural |
| 15 | // numbers, as in: |
| 16 | // |
| 17 | // strictTest(6,5,4,3,2,1) |
| 18 | // |
| 19 | var strictTest = (() => { |
| 20 | "use strict"; |
| 21 | return (a, b, ...c) => { |
| 22 | assertEquals(Array, c.constructor); |
| 23 | assertTrue(Array.isArray(c)); |
| 24 | |
| 25 | var expectedLength = (a === undefined) ? 0 : a - 2; |
| 26 | assertEquals(expectedLength, c.length); |
| 27 | |
| 28 | for (var i = 2; i < a; ++i) { |
| 29 | assertEquals(c[i - 2], a - i); |
| 30 | } |
| 31 | }; |
| 32 | })(); |
| 33 | |
| 34 | var sloppyTest = (a, b, ...c) => { |
| 35 | assertEquals(Array, c.constructor); |
| 36 | assertTrue(Array.isArray(c)); |
| 37 | |
| 38 | var expectedLength = (a === undefined) ? 0 : a - 2; |
| 39 | assertEquals(expectedLength, c.length); |
| 40 | |
| 41 | for (var i = 2; i < a; ++i) { |
| 42 | assertEquals(c[i - 2], a - i); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | |
| 47 | var O = { |
| 48 | strict: strictTest, |
| 49 | sloppy: sloppyTest |
| 50 | }; |
| 51 | |
| 52 | (function testStrictRestParamArity() { |
| 53 | assertEquals(2, strictTest.length); |
| 54 | assertEquals(2, O.strict.length); |
| 55 | })(); |
| 56 | |
| 57 | |
| 58 | (function testRestParamsStrictMode() { |
| 59 | strictTest(); |
| 60 | strictTest(2, 1); |
| 61 | strictTest(6, 5, 4, 3, 2, 1); |
| 62 | strictTest(3, 2, 1); |
| 63 | O.strict(); |
| 64 | O.strict(2, 1); |
| 65 | O.strict(6, 5, 4, 3, 2, 1); |
| 66 | O.strict(3, 2, 1); |
| 67 | })(); |
| 68 | |
| 69 | |
| 70 | (function testRestParamsStrictModeApply() { |
| 71 | strictTest.apply(null, []); |
| 72 | strictTest.apply(null, [2, 1]); |
| 73 | strictTest.apply(null, [6, 5, 4, 3, 2, 1]); |
| 74 | strictTest.apply(null, [3, 2, 1]); |
| 75 | O.strict.apply(O, []); |
| 76 | O.strict.apply(O, [2, 1]); |
| 77 | O.strict.apply(O, [6, 5, 4, 3, 2, 1]); |
| 78 | O.strict.apply(O, [3, 2, 1]); |
| 79 | })(); |
| 80 | |
| 81 | |
| 82 | (function testRestParamsStrictModeCall() { |
| 83 | strictTest.call(null); |
| 84 | strictTest.call(null, 2, 1); |
| 85 | strictTest.call(null, 6, 5, 4, 3, 2, 1); |
| 86 | strictTest.call(null, 3, 2, 1); |
| 87 | O.strict.call(O); |
| 88 | O.strict.call(O, 2, 1); |
| 89 | O.strict.call(O, 6, 5, 4, 3, 2, 1); |
| 90 | O.strict.call(O, 3, 2, 1); |
| 91 | })(); |
| 92 | |
| 93 | |
| 94 | (function testsloppyRestParamArity() { |
| 95 | assertEquals(2, sloppyTest.length); |
| 96 | assertEquals(2, O.sloppy.length); |
| 97 | })(); |
| 98 | |
| 99 | |
| 100 | (function testRestParamssloppyMode() { |
| 101 | sloppyTest(); |
| 102 | sloppyTest(2, 1); |
| 103 | sloppyTest(6, 5, 4, 3, 2, 1); |
| 104 | sloppyTest(3, 2, 1); |
| 105 | O.sloppy(); |
| 106 | O.sloppy(2, 1); |
| 107 | O.sloppy(6, 5, 4, 3, 2, 1); |
| 108 | O.sloppy(3, 2, 1); |
| 109 | })(); |
| 110 | |
| 111 | |
| 112 | (function testRestParamssloppyModeApply() { |
| 113 | sloppyTest.apply(null, []); |
| 114 | sloppyTest.apply(null, [2, 1]); |
| 115 | sloppyTest.apply(null, [6, 5, 4, 3, 2, 1]); |
| 116 | sloppyTest.apply(null, [3, 2, 1]); |
| 117 | O.sloppy.apply(O, []); |
| 118 | O.sloppy.apply(O, [2, 1]); |
| 119 | O.sloppy.apply(O, [6, 5, 4, 3, 2, 1]); |
| 120 | O.sloppy.apply(O, [3, 2, 1]); |
| 121 | })(); |
| 122 | |
| 123 | |
| 124 | (function testRestParamssloppyModeCall() { |
| 125 | sloppyTest.call(null); |
| 126 | sloppyTest.call(null, 2, 1); |
| 127 | sloppyTest.call(null, 6, 5, 4, 3, 2, 1); |
| 128 | sloppyTest.call(null, 3, 2, 1); |
| 129 | O.sloppy.call(O); |
| 130 | O.sloppy.call(O, 2, 1); |
| 131 | O.sloppy.call(O, 6, 5, 4, 3, 2, 1); |
| 132 | O.sloppy.call(O, 3, 2, 1); |
| 133 | })(); |
| 134 | |
| 135 | |
| 136 | (function testUnmappedArguments() { |
| 137 | // Normal functions make their arguments object unmapped, but arrow |
| 138 | // functions don't have an arguments object anyway. Check that the |
| 139 | // right thing happens for arguments in arrow functions with rest |
| 140 | // parameters. |
| 141 | assertSame(arguments, ((...rest) => arguments)()); |
| 142 | })(); |