array-shift.js revision 402d937239b0e2fd11bf2f4fe972ad78aa9fd481
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 shifting array of holes keeps it as array of holes 29(function() { 30 var array = new Array(10); 31 array.shift(); 32 assertFalse(0 in array); 33})(); 34 35// Now check the case with array of holes and some elements on prototype. 36(function() { 37 var len = 9; 38 var array = new Array(len); 39 Array.prototype[3] = "@3"; 40 Array.prototype[7] = "@7"; 41 42 assertEquals(len, array.length); 43 for (var i = 0; i < array.length; i++) { 44 assertEquals(array[i], Array.prototype[i]); 45 } 46 47 array.shift(); 48 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)); 53 54 assertEquals(array[6], Array.prototype[7]); 55 assertTrue(array.hasOwnProperty(6)); 56 57 // ... but keeps the rest as holes: 58 Array.prototype[5] = "@5"; 59 assertEquals(array[5], Array.prototype[5]); 60 assertFalse(array.hasOwnProperty(5)); 61 62 assertEquals(array[3], Array.prototype[3]); 63 assertFalse(array.hasOwnProperty(3)); 64 65 assertEquals(array[7], Array.prototype[7]); 66 assertFalse(array.hasOwnProperty(7)); 67 68 assertTrue(delete Array.prototype[3]); 69 assertTrue(delete Array.prototype[5]); 70 assertTrue(delete Array.prototype[7]); 71})(); 72