Basic HTML version of Foils prepared 3 March 99

Foil 127 Prototype-based Inheritance

From Overview of JavaScript I -- Basic Web Scripting Language CPS616 Technologies of the Information Age -- Spring Semester 99. by Geoffrey C. Fox (Tom Scavo)
1 Define the parent object: function Ellipse( r1, r2 ) { this.r1 = ( r1 > 0 ) ? r1 : 0; this.r2 = ( r2 > 0 ) ? r2 : 0; this.area = new Function( "return Math.PI * this.r1 * this.r2" ); }
2 Define the child object: function Circle( r ) { this.r = ( r > 0 ) ? r : 0; this.parent = Ellipse; this.parent( r, r ); } Circle.prototype = new Ellipse;
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