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41 File Name: 15.4.5.2-2.js
42 ECMA Section: Array.length
45 The length property of this Array object is always numerically greater
46 than the name of every property whose name is an array index.
48 The length property has the attributes { DontEnum, DontDelete }.
50 This test verifies that the Array.length property is not Read Only.
52 Author: christine@netscape.com
53 Date: 12 november 1997
56 var SECTION = "15.4.5.2-2";
57 var VERSION = "ECMA_1";
59 var TITLE = "Array.length";
61 writeHeaderToLog( SECTION + " "+ TITLE);
63 addCase( new Array(), 0, Math.pow(2,14), Math.pow(2,14) );
65 addCase( new Array(), 0, 1, 1 );
67 addCase( new Array(Math.pow(2,12)), Math.pow(2,12), 0, 0 );
68 addCase( new Array(Math.pow(2,13)), Math.pow(2,13), Math.pow(2,12), Math.pow(2,12) );
69 addCase( new Array(Math.pow(2,12)), Math.pow(2,12), Math.pow(2,12), Math.pow(2,12) );
70 addCase( new Array(Math.pow(2,14)), Math.pow(2,14), Math.pow(2,12), Math.pow(2,12) )
72 // some tests where array is not empty
73 // array is populated with strings
74 for ( var arg = "", i = 0; i < Math.pow(2,12); i++ ) {
75 arg += String(i) + ( i != Math.pow(2,12)-1 ? "," : "" );
80 var a = eval( "new Array("+arg+")" );
82 addCase( a, i, i, i );
83 addCase( a, i, Math.pow(2,12)+i+1, Math.pow(2,12)+i+1, true );
84 addCase( a, Math.pow(2,12)+5, 0, 0, true );
88 function addCase( object, old_len, set_len, new_len, checkitems ) {
89 object.length = set_len;
91 new TestCase( SECTION,
92 "array = new Array("+ old_len+"); array.length = " + set_len +
98 // verify that items between old and newlen are all undefined
99 if ( new_len < old_len ) {
101 for ( var i = new_len; i < old_len; i++ ) {
102 if ( object[i] != void 0 ) {
106 new TestCase( SECTION,
107 "verify that array items have been deleted",
111 if ( new_len > old_len ) {
113 for ( var i = old_len; i < new_len; i++ ) {
114 if ( object[i] != void 0 ) {
118 new TestCase( SECTION,
119 "verify that new items are undefined",