Get Programming with Node.js

Lesson 2. Running a Node.js application

In this lesson, you write and run your first JavaScript file with Node.js. At the end, I show you how to import JavaScript files into REPL so you can work with prewritten code.

This lesson covers

• Creating and saving a JavaScript file
• Running your JavaScript file with Node.js
• Loading files into REPL

Consider this

You’re testing some code that you’ve written in JavaScript. Suppose that this code is the function shown in the following snippet, which accepts an array of numbers and prints them to the screen.

Note

In this code example, I use ES6 syntax to assign the variable printNumbers to a function defined with a single arr parameter and an arrow symbol in place of the traditional ...