In the previous section, you created the addNote function, which works well. It starts by creating some static variables, then we fetch any existing notes, we check for duplicates, and if there are none, we push it onto the list, and then we save the data back into the filesystem.
The only problem is that we'll be doing a lot of these steps over and over again for every method. For example, with getAll, the idea is to fetch all of the notes, and send them back to app.js so it can print them to the screen for the user. The first thing we'll to do inside of the getAll statement is have the same code; we'll have our try-catch block to fetch the existing notes.
Now, this is a problem because we'll be repeating code throughout the application. It will be best to break out the fetching of notes and the saving of notes into separate functions that we can...