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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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30 (function() { | 30 (function() { |
31 var array = new Array(10); | 31 var array = new Array(10); |
32 assertEquals(13, array.unshift('1st', '2ns', '3rd')); | 32 assertEquals(13, array.unshift('1st', '2ns', '3rd')); |
33 assertTrue(0 in array); | 33 assertTrue(0 in array); |
34 assertTrue(1 in array); | 34 assertTrue(1 in array); |
35 assertTrue(2 in array); | 35 assertTrue(2 in array); |
36 assertFalse(3 in array); | 36 assertFalse(3 in array); |
37 })(); | 37 })(); |
38 | 38 |
39 | 39 |
40 // Check that unshif with no args has a side-effect of | 40 // Check that unshift with no args has a side-effect of |
41 // feeling the holes with elements from the prototype | 41 // filling the holes with elements from the prototype |
42 // (if present, of course) | 42 // (if present, of course) |
43 (function() { | 43 (function() { |
44 var len = 3; | 44 var len = 3; |
45 var array = new Array(len); | 45 var array = new Array(len); |
46 | 46 |
47 var at0 = '@0'; | 47 var at0 = '@0'; |
48 var at2 = '@2'; | 48 var at2 = '@2'; |
49 | 49 |
50 Array.prototype[0] = at0; | 50 Array.prototype[0] = at0; |
51 Array.prototype[2] = at2; | 51 Array.prototype[2] = at2; |
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108 assertFalse(array.hasOwnProperty(3)); | 108 assertFalse(array.hasOwnProperty(3)); |
109 | 109 |
110 assertEquals(array[7], Array.prototype[7]); | 110 assertEquals(array[7], Array.prototype[7]); |
111 assertFalse(array.hasOwnProperty(7)); | 111 assertFalse(array.hasOwnProperty(7)); |
112 | 112 |
113 assertTrue(delete Array.prototype[3]); | 113 assertTrue(delete Array.prototype[3]); |
114 assertTrue(delete Array.prototype[5]); | 114 assertTrue(delete Array.prototype[5]); |
115 assertTrue(delete Array.prototype[7]); | 115 assertTrue(delete Array.prototype[7]); |
116 })(); | 116 })(); |
117 | 117 |
| 118 // Check that unshift with no args has a side-effect of |
| 119 // filling the holes with elements from the prototype |
| 120 // (if present, of course) |
| 121 (function() { |
| 122 var len = 3; |
| 123 var array = new Array(len); |
| 124 |
| 125 var at0 = '@0'; |
| 126 var at2 = '@2'; |
| 127 |
| 128 var array_proto = []; |
| 129 array_proto[0] = at0; |
| 130 array_proto[2] = at2; |
| 131 array.__proto__ = array_proto; |
| 132 |
| 133 // array owns nothing... |
| 134 assertFalse(array.hasOwnProperty(0)); |
| 135 assertFalse(array.hasOwnProperty(1)); |
| 136 assertFalse(array.hasOwnProperty(2)); |
| 137 |
| 138 // ... but sees values from array_proto. |
| 139 assertEquals(array[0], at0); |
| 140 assertEquals(array[1], undefined); |
| 141 assertEquals(array[2], at2); |
| 142 |
| 143 assertEquals(len, array.unshift()); |
| 144 |
| 145 // unshift makes array own 0 and 2... |
| 146 assertTrue(array.hasOwnProperty(0)); |
| 147 assertFalse(array.hasOwnProperty(1)); |
| 148 assertTrue(array.hasOwnProperty(2)); |
| 149 |
| 150 // ... so they are not affected be delete. |
| 151 assertEquals(array[0], at0); |
| 152 assertEquals(array[1], undefined); |
| 153 assertEquals(array[2], at2); |
| 154 })(); |
| 155 |
| 156 |
| 157 // Now check the case with array of holes and some elements on prototype. |
| 158 (function() { |
| 159 var len = 9; |
| 160 var array = new Array(len); |
| 161 var array_proto = [] |
| 162 array_proto[3] = "@3"; |
| 163 array_proto[7] = "@7"; |
| 164 array.__proto__ = array_proto; |
| 165 |
| 166 assertEquals(len, array.length); |
| 167 for (var i = 0; i < array.length; i++) { |
| 168 assertEquals(array[i], array_proto[i]); |
| 169 } |
| 170 |
| 171 assertEquals(len + 1, array.unshift('head')); |
| 172 |
| 173 assertEquals(len + 1, array.length); |
| 174 // Note that unshift copies values from prototype into the array. |
| 175 assertEquals(array[4], array_proto[3]); |
| 176 assertTrue(array.hasOwnProperty(4)); |
| 177 |
| 178 assertEquals(array[8], array_proto[7]); |
| 179 assertTrue(array.hasOwnProperty(8)); |
| 180 |
| 181 // ... but keeps the rest as holes: |
| 182 array_proto[5] = "@5"; |
| 183 assertEquals(array[5], array_proto[5]); |
| 184 assertFalse(array.hasOwnProperty(5)); |
| 185 |
| 186 assertEquals(array[3], array_proto[3]); |
| 187 assertFalse(array.hasOwnProperty(3)); |
| 188 |
| 189 assertEquals(array[7], array_proto[7]); |
| 190 assertFalse(array.hasOwnProperty(7)); |
| 191 })(); |
| 192 |
118 // Check the behaviour when approaching maximal values for length. | 193 // Check the behaviour when approaching maximal values for length. |
119 (function() { | 194 (function() { |
120 for (var i = 0; i < 7; i++) { | 195 for (var i = 0; i < 7; i++) { |
121 try { | 196 try { |
122 new Array((1 << 32) - 3).unshift(1, 2, 3, 4, 5); | 197 new Array((1 << 32) - 3).unshift(1, 2, 3, 4, 5); |
123 throw 'Should have thrown RangeError'; | 198 throw 'Should have thrown RangeError'; |
124 } catch (e) { | 199 } catch (e) { |
125 assertTrue(e instanceof RangeError); | 200 assertTrue(e instanceof RangeError); |
126 } | 201 } |
127 | 202 |
128 // Check smi boundary | 203 // Check smi boundary |
129 var bigNum = (1 << 30) - 3; | 204 var bigNum = (1 << 30) - 3; |
130 assertEquals(bigNum + 7, new Array(bigNum).unshift(1, 2, 3, 4, 5, 6, 7)); | 205 assertEquals(bigNum + 7, new Array(bigNum).unshift(1, 2, 3, 4, 5, 6, 7)); |
131 } | 206 } |
132 })(); | 207 })(); |
133 | 208 |
134 (function() { | 209 (function() { |
135 for (var i = 0; i < 7; i++) { | 210 for (var i = 0; i < 7; i++) { |
136 var a = [6, 7, 8, 9]; | 211 var a = [6, 7, 8, 9]; |
137 a.unshift(1, 2, 3, 4, 5); | 212 a.unshift(1, 2, 3, 4, 5); |
138 assertEquals([1, 2, 3, 4, 5, 6, 7, 8, 9], a); | 213 assertEquals([1, 2, 3, 4, 5, 6, 7, 8, 9], a); |
139 } | 214 } |
140 })(); | 215 })(); |
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