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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
File Name: proto_10.js
Section:
Description: Determining Instance Relationships
This tests Object Hierarchy and Inheritance, as described in the document
Object Hierarchy and Inheritance in JavaScript, last modified on 12/18/97
15:19:34 on http://devedge.netscape.com/. Current URL:
http://devedge.netscape.com/docs/manuals/communicator/jsobj/contents.htm
This tests the syntax ObjectName.prototype = new PrototypeObject using the
Employee example in the document referenced above.
Author: christine@netscape.com
Date: 12 november 1997
*/
var SECTION = "proto_10";
var VERSION = "JS1_3";
var TITLE = "Determining Instance Relationships";
startTest();
writeHeaderToLog( SECTION + " "+ TITLE);
function InstanceOf( object, constructor ) {
while ( object != null ) {
if ( object == constructor.prototype ) {
return true;
}
object = object.__proto__;
}
return false;
}
function Employee ( name, dept ) {
this.name = name || "";
this.dept = dept || "general";
}
function Manager () {
this.reports = [];
}
Manager.prototype = new Employee();
function WorkerBee ( name, dept, projs ) {
this.base = Employee;
this.base( name, dept)
this.projects = projs || new Array();
}
WorkerBee.prototype = new Employee();
function SalesPerson () {
this.dept = "sales";
this.quota = 100;
}
SalesPerson.prototype = new WorkerBee();
function Engineer ( name, projs, machine ) {
this.base = WorkerBee;
this.base( name, "engineering", projs )
this.machine = machine || "";
}
Engineer.prototype = new WorkerBee();
var pat = new Engineer();
new TestCase( SECTION,
"pat.__proto__ == Engineer.prototype",
true,
pat.__proto__ == Engineer.prototype );
new TestCase( SECTION,
"pat.__proto__.__proto__ == WorkerBee.prototype",
true,
pat.__proto__.__proto__ == WorkerBee.prototype );
new TestCase( SECTION,
"pat.__proto__.__proto__.__proto__ == Employee.prototype",
true,
pat.__proto__.__proto__.__proto__ == Employee.prototype );
new TestCase( SECTION,
"pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype",
true,
pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype );
new TestCase( SECTION,
"pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null",
true,
pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null );
new TestCase( SECTION,
"InstanceOf( pat, Engineer )",
true,
InstanceOf( pat, Engineer ) );
new TestCase( SECTION,
"InstanceOf( pat, WorkerBee )",
true,
InstanceOf( pat, WorkerBee ) );
new TestCase( SECTION,
"InstanceOf( pat, Employee )",
true,
InstanceOf( pat, Employee ) );
new TestCase( SECTION,
"InstanceOf( pat, Object )",
true,
InstanceOf( pat, Object ) );
new TestCase( SECTION,
"InstanceOf( pat, SalesPerson )",
false,
InstanceOf ( pat, SalesPerson ) );
test();
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