Basic HTML version of Foils prepared 20 April 98

Foil 85 User-defined Objects

From Overview of Advanced JavaScript -- Web Scripting Language CPS616 Technologies of the Information Age -- Spring Semester 98. by Tom Scavo,Geoffrey C. Fox
A User-defined Object
Objects are defined with the function statement. The following Circle object, for example, has property r: function Circle( r ) { this.r = r || 1.0; }
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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