tests/mozilla/js1_4/Functions/function-001.js

   1 /* The contents of this file are subject to the Netscape Public
   2  * License Version 1.1 (the "License"); you may not use this file
   3  * except in compliance with the License. You may obtain a copy of
   4  * the License at http://www.mozilla.org/NPL/
   5  *
   6  * Software distributed under the License is distributed on an "AS
   7  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
   8  * implied. See the License for the specific language governing
   9  * rights and limitations under the License.
  10  *
  11  * The Original Code is Mozilla Communicator client code, released March
  12  * 31, 1998.
  13  *
  14  * The Initial Developer of the Original Code is Netscape Communications
  15  * Corporation. Portions created by Netscape are
  16  * Copyright (C) 1998 Netscape Communications Corporation. All
  17  * Rights Reserved.
  18  *
  19  * Contributor(s):
  20  *
  21  */
  22 /**
  23  *  File Name:          function-001.js
  24  *  Description:
  25  *
  26  * http://scopus.mcom.com/bugsplat/show_bug.cgi?id=324455
  27  *
  28  *  Earlier versions of JavaScript supported access to the arguments property
  29  *  of the function object. This property held the arguments to the function.
  30  *  function f() {
  31  *      return f.arguments[0];    // deprecated
  32  *  }
  33  *  var x = f(3);    // x will be 3
  34  *
  35  * This feature is not a part of the final ECMA standard. Instead, scripts
  36  * should simply use just "arguments":
  37  *
  38  * function f() {
  39  *    return arguments[0];    // okay
  40  * }
  41  *
  42  * var x = f(3);    // x will be 3
  43  *
  44  * Again, this feature was motivated by performance concerns. Access to the
  45  * arguments property is not threadsafe, which is of particular concern in
  46  * server environments. Also, the compiler can generate better code for
  47  * functions because it can tell when the arguments are being accessed only by
  48  * name and avoid setting up the arguments object.
  49  *
  50  *  Author:             christine@netscape.com
  51  *  Date:               11 August 1998
  52  */
  53     var SECTION = "function-001.js";
  54     var VERSION = "JS1_4";
  55     var TITLE   = "Accessing the arguments property of a function object";
  56     var BUGNUMBER="324455";
  57     startTest();
  58     writeHeaderToLog( SECTION + " "+ TITLE);
  59
  60     var testcases = new Array();
  61
  62     testcases[tc++] = new TestCase(
  63         SECTION,
  64         "return function.arguments",
  65         "P",
  66         TestFunction_2("P", "A","S","S")[0] +"");
  67
  68
  69     testcases[tc++] = new TestCase(
  70         SECTION,
  71         "return arguments",
  72         "P",
  73         TestFunction_1( "P", "A", "S", "S" )[0] +"");
  74
  75     testcases[tc++] = new TestCase(
  76         SECTION,
  77         "return arguments when function contains an arguments property",
  78         "PASS",
  79         TestFunction_3( "P", "A", "S", "S" ) +"");
  80
  81     testcases[tc++] = new TestCase(
  82         SECTION,
  83         "return function.arguments when function contains an arguments property",
  84         "PASS",
  85         TestFunction_4( "P", "A", "S", "S" ) +"");
  86
  87     test();
  88
  89     function TestFunction_1( a, b, c, d, e ) {
  90         return arguments;
  91     }
  92
  93     function TestFunction_2( a, b, c, d, e ) {
  94         return TestFunction_2.arguments;
  95     }
  96
  97     function TestFunction_3( a, b, c, d, e ) {
  98         var arguments = "PASS";
  99         return arguments;
 100     }
 101
 102     function TestFunction_4( a, b, c, d, e ) {
 103         var arguments = "FAIL";
 104         return Array.prototype.join.call(TestFunction_4.arguments, "");
 105     }
 106