// On the page specific file: 
// "<controller_name>.js", and you import it after the init.js on your application.js
// Replace the <controller_name> with the actual name

MY_APP.<controller_name> = {
  init: function() {
     // Your shared code for the whole controller goes here
   },
  index: function() {
    // Your code for the index page goes here
  },
  edit: function() {
    // Your code for the edit page goes here
  }
}