1// Copyright 2008 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/** 29 * @fileoverview Test concat on small and large arrays 30 */ 31 32var poses = [140, 4000000000]; 33while (pos = poses.shift()) { 34 var a = new Array(pos); 35 assertEquals(pos, a.length); 36 a.push('foo'); 37 assertEquals(pos + 1, a.length); 38 var b = ['bar']; 39 var c = a.concat(b); 40 assertEquals(pos + 2, c.length); 41 assertEquals("undefined", typeof(c[pos - 1])); 42 assertEquals("foo", c[pos]); 43 assertEquals("bar", c[pos + 1]); 44 45 // Can we fool the system by putting a number in a string? 46 var onetwofour = "124"; 47 a[onetwofour] = 'doo'; 48 assertEquals(a[124], 'doo'); 49 c = a.concat(b); 50 assertEquals(c[124], 'doo'); 51 52 // If we put a number in the prototype, then the spec says it should be 53 // copied on concat. 54 Array.prototype["123"] = 'baz'; 55 assertEquals(a[123], 'baz'); 56 57 c = a.concat(b); 58 assertEquals(pos + 2, c.length); 59 assertEquals("baz", c[123]); 60 assertEquals("undefined", typeof(c[pos - 1])); 61 assertEquals("foo", c[pos]); 62 assertEquals("bar", c[pos + 1]); 63 64 // When we take the number off the prototype it disappears from a, but 65 // the concat put it in c itself. 66 Array.prototype["123"] = undefined; 67 assertEquals("undefined", typeof(a[123])); 68 assertEquals("baz", c[123]); 69 70 // If the element of prototype is shadowed, the element on the instance 71 // should be copied, but not the one on the prototype. 72 Array.prototype[123] = 'baz'; 73 a[123] = 'xyz'; 74 assertEquals('xyz', a[123]); 75 c = a.concat(b); 76 assertEquals('xyz', c[123]); 77 78 // Non-numeric properties on the prototype or the array shouldn't get 79 // copied. 80 Array.prototype.moe = 'joe'; 81 a.ben = 'jerry'; 82 assertEquals(a["moe"], 'joe'); 83 assertEquals(a["ben"], 'jerry'); 84 c = a.concat(b); 85 // ben was not copied 86 assertEquals("undefined", typeof(c.ben)); 87 // moe was not copied, but we can see it through the prototype 88 assertEquals("joe", c.moe); 89 90 // When we take moe off the prototype it disappears from all arrays. 91 Array.prototype.moe = undefined; 92 assertEquals("undefined", typeof(c.moe)); 93 94 // Negative indeces don't get concated. 95 a[-1] = 'minus1'; 96 assertEquals("minus1", a[-1]); 97 assertEquals("undefined", typeof(a[0xffffffff])); 98 c = a.concat(b); 99 assertEquals("undefined", typeof(c[-1])); 100 assertEquals("undefined", typeof(c[0xffffffff])); 101 assertEquals(c.length, a.length + 1); 102 103} 104 105a = []; 106c = a.concat('Hello'); 107assertEquals(1, c.length); 108assertEquals("Hello", c[0]); 109assertEquals("Hello", c.toString()); 110 111// Check that concat preserves holes. 112var holey = [void 0,'a',,'c'].concat(['d',,'f',[0,,2],void 0]) 113assertEquals(9, holey.length); // hole in embedded array is ignored 114for (var i = 0; i < holey.length; i++) { 115 if (i == 2 || i == 5) { 116 assertFalse(i in holey); 117 } else { 118 assertTrue(i in holey); 119 } 120} 121