gistfile1.js

// Do not do this
var SomeController = Ember.ArrayController.extend({
  init: function() {
    this._super.apply(this, arguments) // easy to forget, can introduce typos, etc

    // your code here
  }
});

// Do this
var SomeController = Ember.ArrayController.extend({
  // The name of the function and the observing make the intent clearer
  // than the code above, and it can be reused if needed.
  // Also, less chances to do something wrong.
  somethingOnInit: function() {
    // your code here
  }.on('init')
});