Method Chaining

Method chaining is a programming strategy that simplifies your code and beautifies it. Method chaining is done by ensuring that each method on an object returns the entire object, instead of returning a single element of that object. For example:

1function door(){
2    this.height="";
3    this.width="";
4    this.status="close";
5}
6door.prototype.Open=function ()
7{
8    this.status="Open"
9    return this
10}
11door.prototype.Closed=function ()
12{
13    this.status="closed"
14    return this
15}
16door.prototype.setProperty=function (width,height)
17{
18    this.width = width;
19 this.height = height;
20 return this;
21
22}
23door.prototype.doorStatus=function ()
24{
25    console.log('The',this.width,'x',this.height,'Door is',this.status);
26 return this;
27}
28
29var smallDoor=new door()
30smallDoor.setProperty(20,40).Open().doorStatus().Closed().doorStatus();
31

Note that each method in Door.prototype returns this, which refers to the entire instance of that Door object.