1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
// Copyright 2014 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.
// Flags: --harmony-rest-parameters
(function testRestIndex() {
assertEquals(5, ((...args) => args.length)(1,2,3,4,5));
assertEquals(4, ((a, ...args) => args.length)(1,2,3,4,5));
assertEquals(3, ((a, b, ...args) => args.length)(1,2,3,4,5));
assertEquals(2, ((a, b, c, ...args) => args.length)(1,2,3,4,5));
assertEquals(1, ((a, b, c, d, ...args) => args.length)(1,2,3,4,5));
assertEquals(0, ((a, b, c, d, e, ...args) => args.length)(1,2,3,4,5));
})();
// strictTest and sloppyTest should be called with descending natural
// numbers, as in:
//
// strictTest(6,5,4,3,2,1)
//
var strictTest = (() => {
"use strict";
return (a, b, ...c) => {
assertEquals(Array, c.constructor);
assertTrue(Array.isArray(c));
var expectedLength = (a === undefined) ? 0 : a - 2;
assertEquals(expectedLength, c.length);
for (var i = 2; i < a; ++i) {
assertEquals(c[i - 2], a - i);
}
};
})();
var sloppyTest = (a, b, ...c) => {
assertEquals(Array, c.constructor);
assertTrue(Array.isArray(c));
var expectedLength = (a === undefined) ? 0 : a - 2;
assertEquals(expectedLength, c.length);
for (var i = 2; i < a; ++i) {
assertEquals(c[i - 2], a - i);
}
}
var O = {
strict: strictTest,
sloppy: sloppyTest
};
(function testStrictRestParamArity() {
assertEquals(2, strictTest.length);
assertEquals(2, O.strict.length);
})();
(function testRestParamsStrictMode() {
strictTest();
strictTest(2, 1);
strictTest(6, 5, 4, 3, 2, 1);
strictTest(3, 2, 1);
O.strict();
O.strict(2, 1);
O.strict(6, 5, 4, 3, 2, 1);
O.strict(3, 2, 1);
})();
(function testRestParamsStrictModeApply() {
strictTest.apply(null, []);
strictTest.apply(null, [2, 1]);
strictTest.apply(null, [6, 5, 4, 3, 2, 1]);
strictTest.apply(null, [3, 2, 1]);
O.strict.apply(O, []);
O.strict.apply(O, [2, 1]);
O.strict.apply(O, [6, 5, 4, 3, 2, 1]);
O.strict.apply(O, [3, 2, 1]);
})();
(function testRestParamsStrictModeCall() {
strictTest.call(null);
strictTest.call(null, 2, 1);
strictTest.call(null, 6, 5, 4, 3, 2, 1);
strictTest.call(null, 3, 2, 1);
O.strict.call(O);
O.strict.call(O, 2, 1);
O.strict.call(O, 6, 5, 4, 3, 2, 1);
O.strict.call(O, 3, 2, 1);
})();
(function testsloppyRestParamArity() {
assertEquals(2, sloppyTest.length);
assertEquals(2, O.sloppy.length);
})();
(function testRestParamssloppyMode() {
sloppyTest();
sloppyTest(2, 1);
sloppyTest(6, 5, 4, 3, 2, 1);
sloppyTest(3, 2, 1);
O.sloppy();
O.sloppy(2, 1);
O.sloppy(6, 5, 4, 3, 2, 1);
O.sloppy(3, 2, 1);
})();
(function testRestParamssloppyModeApply() {
sloppyTest.apply(null, []);
sloppyTest.apply(null, [2, 1]);
sloppyTest.apply(null, [6, 5, 4, 3, 2, 1]);
sloppyTest.apply(null, [3, 2, 1]);
O.sloppy.apply(O, []);
O.sloppy.apply(O, [2, 1]);
O.sloppy.apply(O, [6, 5, 4, 3, 2, 1]);
O.sloppy.apply(O, [3, 2, 1]);
})();
(function testRestParamssloppyModeCall() {
sloppyTest.call(null);
sloppyTest.call(null, 2, 1);
sloppyTest.call(null, 6, 5, 4, 3, 2, 1);
sloppyTest.call(null, 3, 2, 1);
O.sloppy.call(O);
O.sloppy.call(O, 2, 1);
O.sloppy.call(O, 6, 5, 4, 3, 2, 1);
O.sloppy.call(O, 3, 2, 1);
})();
(function testUnmappedArguments() {
// Normal functions make their arguments object unmapped, but arrow
// functions don't have an arguments object anyway. Check that the
// right thing happens for arguments in arrow functions with rest
// parameters.
assertSame(arguments, ((...rest) => arguments)());
})();
|
