In this chapter, you learned that parsing in process.argv can be a real pain. We would have to write a lot of manual code to parse out those hyphens, the equal signs, and the optional quotes. However, yargs can do all of that for us and it puts it on a really simple object we can access. You also learned how to work with JSON inside Node.js.
Next, we filled out the addNote function. We're able to add notes using the command line, and we're able to save those notes into a JSON file. Finally, we pulled out a lot of the code from addNote into separate functions, fetchNotes and saveNotes, which are now separate, and they're able to be reused throughout the code. When we start filling out the other methods, we can simply call fetchNotes and saveNotes instead of having to copy the contents over and over again to every new method.
In the next chapter, we'll...