Learning Node.js Development

Using chaining syntax on yargs

Now in order to get started, we need to make some changes inside of app.js. We're going to start with the add command (for more information, please refer to the Adding and saving notes section in the previous chapter).

We want to add a few helpful pieces of information in argv function inside app.js, that will:

• Let yargs verify the add command is ran appropriately, and
• Let the user know how the add command is meant to be executed

Now we are going to be chaining property calls, which means right before I access .argv I want to call .command, and then I'll call .argv on the return value from command as shown here:

const argv = yargs  .command()  .argv;

Now this chaining syntax probably looks familiar if you've ...