Question: I'm a newbie ruby on rails developer. I've just created my first application and made use of the the `bootstrap` carousel. Now, I want to add some `javascript`. My application does not have any custom `javascript` at this point. What I want to do is when the `left` or `right` button on the carousel is pressed, I want an `alert` to pop up. Preferably, I want to include my `javascript` file in the `/assets/javascript` directory. The purpose of this is to just learn how to add new `javascript` files in my application.

Answer: 
Adding your custom javascript to your rails app is real easy, just follow the steps below :-

* create a file (say custom.js) under **app/assets/javascripts/**
* Open up your manifest file i.e **application.js** (this is the file where you need to include every javascript file you want to load into your rails app, add the script name to it **//=require custom**.
* Visit your rails app from browser and check the page source and search for custom.js being loaded or not thats all.
For Rails 6

Add your javascript code under /app/javascript//file.js

and then in app/packs/application.js 

`require("<folder name>/file")`