Basic HTML version of Foils prepared 3 March 99

Foil 122 User-defined Objects

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 Objects are defined with the function statement. The following Circle object, for example, has property r: function Circle( r ) { this.r = ( r > 0 ) ? r : 0; }
2 The this keyword permits this function to be used as a constructor: var c = new Circle( 2.0 ); var area = Math.PI * c.r * c.r;
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