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Predefining Objects with Constructor Functions in Siebel eScript

A constructor function creates an object template. For example, a constructor function to create Rectangle objects might be defined like the following:

function Rectangle(width, height)
   this.width = width;
   this.height = height;

The keyword this is used to refer to the parameters passed to the constructor function and can be conceptually thought of as "this object." To create a Rectangle object, call the constructor function with the "new" operator:

var joe = new Rectangle(3,4)
var sally = new Rectangle(5,3);

This code fragment creates two rectangle objects: one named joe, with a width of 3 and a height of 4, and another named sally, with a width of 5 and a height of 3.

Constructor functions create objects belonging to the same class. Every object created by a constructor function is called an instance of that class. The preceding example creates a Rectangle class and two instances of it. Instances of a class share the same properties, although a particular instance of the class may have additional properties unique to it. For example, if you add the following line:

joe.motto = "Be prepared!";

you add a motto property to the rectangle joe. However, the rectangle sally has no motto property.

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