Put it in its own js file. If you bundle them, it won't be an additional performance hit.

>>You should know that you never repeat code. Create a class called Shared and put it in the Contollers folder.
>>
>>Note: this isn't the best way, but it's easy and gets the job done. Much refactoring would be needed to do things a better way.
>>
>
>I am talking about JavaScript code, not the c# code here. I want to share same function between angularJs controllers which are defined in the same .js file and are in the Scripts folder under particular area.