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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// Flags: --min-preparse-length=0
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//
21var strictTest = (function() {
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
36var 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
49var 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})();
145