JavaScript is primarily known to be a client side scripting language. What if we could use JavaScript on the server itself. That way as a programmer you will be able to use your JavaScript skills not only on client side but also on the server side.
nodejs
Why NodeJs REPL prints undefined?
We know that REPL stand for READ, EVALUATE, PRINT and LOOP. So when we use a NodeJS REPL, every line of code that we write is immediately processed or evaluated.