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
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
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11 // with the distribution.
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13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 // Check that shifting array of holes keeps it as array of holes
30 var array = new Array(10);
32 assertFalse(0 in array);
35 // Now check the case with array of holes and some elements on prototype.
38 var array = new Array(len);
39 Array.prototype[3] = "@3";
40 Array.prototype[7] = "@7";
42 assertEquals(len, array.length);
43 for (var i = 0; i < array.length; i++) {
44 assertEquals(array[i], Array.prototype[i]);
49 assertEquals(len - 1, array.length);
50 // Note that shift copies values from prototype into the array.
51 assertEquals(array[2], Array.prototype[3]);
52 assertTrue(array.hasOwnProperty(2));
54 assertEquals(array[6], Array.prototype[7]);
55 assertTrue(array.hasOwnProperty(6));
57 // ... but keeps the rest as holes:
58 Array.prototype[5] = "@5";
59 assertEquals(array[5], Array.prototype[5]);
60 assertFalse(array.hasOwnProperty(5));
62 assertEquals(array[3], Array.prototype[3]);
63 assertFalse(array.hasOwnProperty(3));
65 assertEquals(array[7], Array.prototype[7]);
66 assertFalse(array.hasOwnProperty(7));
68 assertTrue(delete Array.prototype[3]);
69 assertTrue(delete Array.prototype[5]);
70 assertTrue(delete Array.prototype[7]);
73 // Now check the case with array of holes and some elements on prototype
74 // which is an array itself.
77 var array = new Array(len);
78 var array_proto = new Array();
79 array_proto[3] = "@3";
80 array_proto[7] = "@7";
81 array.__proto__ = array_proto;
83 assertEquals(len, array.length);
84 for (var i = 0; i < array.length; i++) {
85 assertEquals(array[i], array_proto[i]);
90 assertEquals(len - 1, array.length);
91 // Note that shift copies values from prototype into the array.
92 assertEquals(array[2], array_proto[3]);
93 assertTrue(array.hasOwnProperty(2));
95 assertEquals(array[6], array_proto[7]);
96 assertTrue(array.hasOwnProperty(6));
98 // ... but keeps the rest as holes:
99 array_proto[5] = "@5";
100 assertEquals(array[5], array_proto[5]);
101 assertFalse(array.hasOwnProperty(5));
103 assertEquals(array[3], array_proto[3]);
104 assertFalse(array.hasOwnProperty(3));
106 assertEquals(array[7], array_proto[7]);
107 assertFalse(array.hasOwnProperty(7));
110 // Check that non-enumerable elements are treated appropriately
112 var array = [1, 2, 3];
113 Object.defineProperty(array, '1', {enumerable: false});
114 assertEquals(1, array.shift());
115 assertEquals([2, 3], array);
118 array.__proto__[1] = 2;
119 Object.defineProperty(array.__proto__, '1', {enumerable: false});
120 assertEquals(1, array.shift());
121 assertEquals([2, 3], array);