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41 File Name: proto_10.js
43 Description: Determining Instance Relationships
45 This tests Object Hierarchy and Inheritance, as described in the document
46 Object Hierarchy and Inheritance in JavaScript, last modified on 12/18/97
47 15:19:34 on http://devedge.netscape.com/. Current URL:
48 http://devedge.netscape.com/docs/manuals/communicator/jsobj/contents.htm
50 This tests the syntax ObjectName.prototype = new PrototypeObject using the
51 Employee example in the document referenced above.
53 Author: christine@netscape.com
54 Date: 12 november 1997
57 var SECTION = "proto_10";
58 var VERSION = "JS1_3";
59 var TITLE = "Determining Instance Relationships";
62 writeHeaderToLog( SECTION + " "+ TITLE);
64 function InstanceOf( object, constructor ) {
65 while ( object != null ) {
66 if ( object == constructor.prototype ) {
69 object = object.__proto__;
73 function Employee ( name, dept ) {
74 this.name = name || "";
75 this.dept = dept || "general";
81 Manager.prototype = new Employee();
83 function WorkerBee ( name, dept, projs ) {
85 this.base( name, dept)
86 this.projects = projs || new Array();
88 WorkerBee.prototype = new Employee();
90 function SalesPerson () {
94 SalesPerson.prototype = new WorkerBee();
96 function Engineer ( name, projs, machine ) {
97 this.base = WorkerBee;
98 this.base( name, "engineering", projs )
99 this.machine = machine || "";
101 Engineer.prototype = new WorkerBee();
103 var pat = new Engineer();
105 new TestCase( SECTION,
106 "pat.__proto__ == Engineer.prototype",
108 pat.__proto__ == Engineer.prototype );
110 new TestCase( SECTION,
111 "pat.__proto__.__proto__ == WorkerBee.prototype",
113 pat.__proto__.__proto__ == WorkerBee.prototype );
115 new TestCase( SECTION,
116 "pat.__proto__.__proto__.__proto__ == Employee.prototype",
118 pat.__proto__.__proto__.__proto__ == Employee.prototype );
120 new TestCase( SECTION,
121 "pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype",
123 pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype );
125 new TestCase( SECTION,
126 "pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null",
128 pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null );
131 new TestCase( SECTION,
132 "InstanceOf( pat, Engineer )",
134 InstanceOf( pat, Engineer ) );
136 new TestCase( SECTION,
137 "InstanceOf( pat, WorkerBee )",
139 InstanceOf( pat, WorkerBee ) );
141 new TestCase( SECTION,
142 "InstanceOf( pat, Employee )",
144 InstanceOf( pat, Employee ) );
146 new TestCase( SECTION,
147 "InstanceOf( pat, Object )",
149 InstanceOf( pat, Object ) );
151 new TestCase( SECTION,
152 "InstanceOf( pat, SalesPerson )",
154 InstanceOf ( pat, SalesPerson ) );