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      1 /**
      2     File Name:          instanceof-002.js
      3     Section:
      4     Description:        Determining Instance Relationships
      5 
      6     This test is the same as js1_3/inherit/proto-002, except that it uses
      7     the builtin instanceof operator rather than a user-defined function
      8     called InstanceOf.
      9 
     10     This tests Object Hierarchy and Inheritance, as described in the document
     11     Object Hierarchy and Inheritance in JavaScript, last modified on 12/18/97
     12     15:19:34 on http://devedge.netscape.com/.  Current URL:
     13     http://devedge.netscape.com/docs/manuals/communicator/jsobj/contents.htm
     14 
     15     This tests the syntax ObjectName.prototype = new PrototypeObject using the
     16     Employee example in the document referenced above.
     17 
     18     Author:             christine (at) netscape.com
     19     Date:               12 november 1997
     20 */
     21 //    onerror = err;
     22 
     23     var SECTION = "instanceof-002";
     24     var VERSION = "ECMA_2";
     25     var TITLE   = "Determining Instance Relationships";
     26 
     27     startTest();
     28     writeHeaderToLog( SECTION + " "+ TITLE);
     29 
     30     var tc = 0;
     31     var testcases = new Array();
     32 
     33 function InstanceOf( object, constructor ) {
     34     while ( object != null ) {
     35         if ( object == constructor.prototype ) {
     36             return true;
     37         }
     38         object = object.__proto__;
     39     }
     40     return false;
     41 }
     42 
     43 function Employee ( name, dept ) {
     44      this.name = name || "";
     45      this.dept = dept || "general";
     46 }
     47 
     48 function Manager () {
     49      this.reports = [];
     50 }
     51 Manager.prototype = new Employee();
     52 
     53 function WorkerBee ( name, dept, projs ) {
     54     this.base = Employee;
     55     this.base( name, dept)
     56     this.projects = projs || new Array();
     57 }
     58 WorkerBee.prototype = new Employee();
     59 
     60 function SalesPerson () {
     61     this.dept = "sales";
     62     this.quota = 100;
     63 }
     64 SalesPerson.prototype = new WorkerBee();
     65 
     66 function Engineer ( name, projs, machine ) {
     67     this.base = WorkerBee;
     68     this.base( name, "engineering", projs )
     69     this.machine = machine || "";
     70 }
     71 Engineer.prototype = new WorkerBee();
     72 
     73 var pat = new Engineer()
     74 
     75     testcases[tc++] = new TestCase( SECTION,
     76                                     "pat.__proto__ == Engineer.prototype",
     77                                     true,
     78                                     pat.__proto__ == Engineer.prototype );
     79 
     80     testcases[tc++] = new TestCase( SECTION,
     81                                     "pat.__proto__.__proto__ == WorkerBee.prototype",
     82                                     true,
     83                                     pat.__proto__.__proto__ == WorkerBee.prototype );
     84 
     85     testcases[tc++] = new TestCase( SECTION,
     86                                     "pat.__proto__.__proto__.__proto__ == Employee.prototype",
     87                                     true,
     88                                     pat.__proto__.__proto__.__proto__ == Employee.prototype );
     89 
     90     testcases[tc++] = new TestCase( SECTION,
     91                                     "pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype",
     92                                     true,
     93                                     pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype );
     94 
     95     testcases[tc++] = new TestCase( SECTION,
     96                                     "pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null",
     97                                     true,
     98                                     pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null );
     99 
    100     testcases[tc++] = new TestCase( SECTION,
    101                                     "pat instanceof Engineer",
    102                                     true,
    103                                     pat instanceof Engineer );
    104 
    105     testcases[tc++] = new TestCase( SECTION,
    106                                     "pat instanceof WorkerBee )",
    107                                     true,
    108                                      pat instanceof WorkerBee );
    109 
    110     testcases[tc++] = new TestCase( SECTION,
    111                                     "pat instanceof Employee )",
    112                                     true,
    113                                      pat instanceof Employee );
    114 
    115     testcases[tc++] = new TestCase( SECTION,
    116                                     "pat instanceof Object )",
    117                                     true,
    118                                      pat instanceof Object );
    119 
    120     testcases[tc++] = new TestCase( SECTION,
    121                                     "pat instanceof SalesPerson )",
    122                                     false,
    123                                      pat instanceof SalesPerson );
    124     test();
    125