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How the Constructor Function Creates an Object

A constructor function creates an object template. To create a rectangle object, the following example uses a constructor function:

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

The following keyword references the arguments that the constructor function receives:

this

You can think of the this keyword as meaning this object.

Example of Using a Constructor Function

To create a rectangle object, the following example uses the new operator to call the constructor function:

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

This code creates the following rectangle objects:

• Joe, with a width of 3 and a height of 4
• Sally, with a width of 5 and a height of 3

This example creates a Rectangle class and two instances of this class. A constructor function creates objects that belong to the same class. Every object that a constructor function creates is an instance of that class.

Class instances share the same properties, although a single class instance can possess more unique properties. For example, adding the following code to the example adds a motto property to the joe rectangle. The sally rectangle does not include a motto property:

joe.motto = "Be prepared!";