Technical requirements

The major requirement is to have Node.js and NPM installed. You can follow the official installation guide available at https://nodejs.org/en/download/ to install Node for your operating system. The code for this chapter can be found in the GitHub repo here: https://github.com/PacktPublishing/Building-Data-Driven-Applications-with-Danfo.js/tree/main/Chapter01.

We will start this section by understanding the difference between let and var, and why you should use let more often.