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| 1 // Copyright 2010 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are |
| 4 // met: |
| 5 // |
| 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided |
| 11 // with the distribution. |
| 12 // * Neither the name of Google Inc. nor the names of its |
| 13 // contributors may be used to endorse or promote products derived |
| 14 // from this software without specific prior written permission. |
| 15 // |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 |
| 28 // Check that unshifting array of holes keeps the original array |
| 29 // as array of holes |
| 30 (function() { |
| 31 var array = new Array(10); |
| 32 assertEquals(13, array.unshift('1st', '2ns', '3rd')); |
| 33 assertTrue(0 in array); |
| 34 assertTrue(1 in array); |
| 35 assertTrue(2 in array); |
| 36 assertFalse(3 in array); |
| 37 })(); |
| 38 |
| 39 |
| 40 // Check that unshif with no args has a side-effect of |
| 41 // feeling the holes with elements from the prototype |
| 42 // (if present, of course) |
| 43 (function() { |
| 44 var len = 3; |
| 45 var array = new Array(len); |
| 46 |
| 47 var at0 = '@0'; |
| 48 var at2 = '@2'; |
| 49 |
| 50 Array.prototype[0] = at0; |
| 51 Array.prototype[2] = at2; |
| 52 |
| 53 // array owns nothing... |
| 54 assertFalse(array.hasOwnProperty(0)); |
| 55 assertFalse(array.hasOwnProperty(1)); |
| 56 assertFalse(array.hasOwnProperty(2)); |
| 57 |
| 58 // ... but sees values from Array.prototype |
| 59 assertEquals(array[0], at0); |
| 60 assertEquals(array[1], undefined); |
| 61 assertEquals(array[2], at2); |
| 62 |
| 63 assertEquals(len, array.unshift()); |
| 64 |
| 65 assertTrue(delete Array.prototype[0]); |
| 66 assertTrue(delete Array.prototype[2]); |
| 67 |
| 68 // unshift makes array own 0 and 2... |
| 69 assertTrue(array.hasOwnProperty(0)); |
| 70 assertFalse(array.hasOwnProperty(1)); |
| 71 assertTrue(array.hasOwnProperty(2)); |
| 72 |
| 73 // ... so they are not affected be delete. |
| 74 assertEquals(array[0], at0); |
| 75 assertEquals(array[1], undefined); |
| 76 assertEquals(array[2], at2); |
| 77 })(); |
| 78 |
| 79 |
| 80 // Now check the case with array of holes and some elements on prototype. |
| 81 (function() { |
| 82 var len = 9; |
| 83 var array = new Array(len); |
| 84 Array.prototype[3] = "@3"; |
| 85 Array.prototype[7] = "@7"; |
| 86 |
| 87 assertEquals(len, array.length); |
| 88 for (var i = 0; i < array.length; i++) { |
| 89 assertEquals(array[i], Array.prototype[i]); |
| 90 } |
| 91 |
| 92 assertEquals(len + 1, array.unshift('head')); |
| 93 |
| 94 assertEquals(len + 1, array.length); |
| 95 // Note that unshift copies values from prototype into the array. |
| 96 assertEquals(array[4], Array.prototype[3]); |
| 97 assertTrue(array.hasOwnProperty(4)); |
| 98 |
| 99 assertEquals(array[8], Array.prototype[7]); |
| 100 assertTrue(array.hasOwnProperty(8)); |
| 101 |
| 102 // ... but keeps the rest as holes: |
| 103 Array.prototype[5] = "@5"; |
| 104 assertEquals(array[5], Array.prototype[5]); |
| 105 assertFalse(array.hasOwnProperty(5)); |
| 106 |
| 107 assertEquals(array[3], Array.prototype[3]); |
| 108 assertFalse(array.hasOwnProperty(3)); |
| 109 |
| 110 assertEquals(array[7], Array.prototype[7]); |
| 111 assertFalse(array.hasOwnProperty(7)); |
| 112 |
| 113 assertTrue(delete Array.prototype[3]); |
| 114 assertTrue(delete Array.prototype[5]); |
| 115 assertTrue(delete Array.prototype[7]); |
| 116 })(); |
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