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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 // Flags: --harmony-rest-parameters | |
6 | |
7 (function testRestIndex() { | |
8 assertEquals(5, ((...args) => args.length)(1,2,3,4,5)); | |
9 assertEquals(4, ((a, ...args) => args.length)(1,2,3,4,5)); | |
10 assertEquals(3, ((a, b, ...args) => args.length)(1,2,3,4,5)); | |
11 assertEquals(2, ((a, b, c, ...args) => args.length)(1,2,3,4,5)); | |
12 assertEquals(1, ((a, b, c, d, ...args) => args.length)(1,2,3,4,5)); | |
13 assertEquals(0, ((a, b, c, d, e, ...args) => args.length)(1,2,3,4,5)); | |
14 })(); | |
15 | |
16 // strictTest and sloppyTest should be called with descending natural | |
17 // numbers, as in: | |
18 // | |
19 // strictTest(6,5,4,3,2,1) | |
20 // | |
21 var strictTest = (() => { | |
22 "use strict"; | |
23 return (a, b, ...c) => { | |
24 assertEquals(Array, c.constructor); | |
25 assertTrue(Array.isArray(c)); | |
26 | |
27 var expectedLength = (a === undefined) ? 0 : a - 2; | |
28 assertEquals(expectedLength, c.length); | |
29 | |
30 for (var i = 2; i < a; ++i) { | |
31 assertEquals(c[i - 2], a - i); | |
32 } | |
33 }; | |
34 })(); | |
35 | |
36 var sloppyTest = (a, b, ...c) => { | |
37 assertEquals(Array, c.constructor); | |
38 assertTrue(Array.isArray(c)); | |
39 | |
40 var expectedLength = (a === undefined) ? 0 : a - 2; | |
41 assertEquals(expectedLength, c.length); | |
42 | |
43 for (var i = 2; i < a; ++i) { | |
44 assertEquals(c[i - 2], a - i); | |
45 } | |
46 } | |
47 | |
48 | |
49 var O = { | |
50 strict: strictTest, | |
51 sloppy: sloppyTest | |
52 }; | |
53 | |
54 (function testStrictRestParamArity() { | |
55 assertEquals(2, strictTest.length); | |
56 assertEquals(2, O.strict.length); | |
57 })(); | |
58 | |
59 | |
60 (function testRestParamsStrictMode() { | |
61 strictTest(); | |
62 strictTest(2, 1); | |
63 strictTest(6, 5, 4, 3, 2, 1); | |
64 strictTest(3, 2, 1); | |
65 O.strict(); | |
66 O.strict(2, 1); | |
67 O.strict(6, 5, 4, 3, 2, 1); | |
68 O.strict(3, 2, 1); | |
69 })(); | |
70 | |
71 | |
72 (function testRestParamsStrictModeApply() { | |
73 strictTest.apply(null, []); | |
74 strictTest.apply(null, [2, 1]); | |
75 strictTest.apply(null, [6, 5, 4, 3, 2, 1]); | |
76 strictTest.apply(null, [3, 2, 1]); | |
77 O.strict.apply(O, []); | |
78 O.strict.apply(O, [2, 1]); | |
79 O.strict.apply(O, [6, 5, 4, 3, 2, 1]); | |
80 O.strict.apply(O, [3, 2, 1]); | |
81 })(); | |
82 | |
83 | |
84 (function testRestParamsStrictModeCall() { | |
85 strictTest.call(null); | |
86 strictTest.call(null, 2, 1); | |
87 strictTest.call(null, 6, 5, 4, 3, 2, 1); | |
88 strictTest.call(null, 3, 2, 1); | |
89 O.strict.call(O); | |
90 O.strict.call(O, 2, 1); | |
91 O.strict.call(O, 6, 5, 4, 3, 2, 1); | |
92 O.strict.call(O, 3, 2, 1); | |
93 })(); | |
94 | |
95 | |
96 (function testsloppyRestParamArity() { | |
97 assertEquals(2, sloppyTest.length); | |
98 assertEquals(2, O.sloppy.length); | |
99 })(); | |
100 | |
101 | |
102 (function testRestParamssloppyMode() { | |
103 sloppyTest(); | |
104 sloppyTest(2, 1); | |
105 sloppyTest(6, 5, 4, 3, 2, 1); | |
106 sloppyTest(3, 2, 1); | |
107 O.sloppy(); | |
108 O.sloppy(2, 1); | |
109 O.sloppy(6, 5, 4, 3, 2, 1); | |
110 O.sloppy(3, 2, 1); | |
111 })(); | |
112 | |
113 | |
114 (function testRestParamssloppyModeApply() { | |
115 sloppyTest.apply(null, []); | |
116 sloppyTest.apply(null, [2, 1]); | |
117 sloppyTest.apply(null, [6, 5, 4, 3, 2, 1]); | |
118 sloppyTest.apply(null, [3, 2, 1]); | |
119 O.sloppy.apply(O, []); | |
120 O.sloppy.apply(O, [2, 1]); | |
121 O.sloppy.apply(O, [6, 5, 4, 3, 2, 1]); | |
122 O.sloppy.apply(O, [3, 2, 1]); | |
123 })(); | |
124 | |
125 | |
126 (function testRestParamssloppyModeCall() { | |
127 sloppyTest.call(null); | |
128 sloppyTest.call(null, 2, 1); | |
129 sloppyTest.call(null, 6, 5, 4, 3, 2, 1); | |
130 sloppyTest.call(null, 3, 2, 1); | |
131 O.sloppy.call(O); | |
132 O.sloppy.call(O, 2, 1); | |
133 O.sloppy.call(O, 6, 5, 4, 3, 2, 1); | |
134 O.sloppy.call(O, 3, 2, 1); | |
135 })(); | |
136 | |
137 | |
138 (function testUnmappedArguments() { | |
139 // Normal functions make their arguments object unmapped, but arrow | |
140 // functions don't have an arguments object anyway. Check that the | |
141 // right thing happens for arguments in arrow functions with rest | |
142 // parameters. | |
143 assertSame(arguments, ((...rest) => arguments)()); | |
144 })(); | |
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