test.js

yasksrivastava at Yasks-MacBook-Pro in ~/learnyoureact
$ node
> function calc(){
... this.a = 5;
... }
undefined
> calc()
undefined
> calc
[Function: calc]
> calc.a
undefined
> function calc(){
... return this.a
... }
undefined
> calc
[Function: calc]
> calc()
5
> function calc(){
... this.b = 'yask';
... }
undefined
>