REPL

Read Evaluate Print Loop (REPL)

As the heading suggests, REPL does exactly what it stands for. You may already have used a REPL environment before but might not have known about it. Terminals, and even the console on Google Chrome, are REPL environments. A REPL environment can be a quick and easy way to test some code. Think of it as a rough paper to run some code quickly. The REPL reads the code, evaluates it, and prints the output in the next line. This happens in a loop until the REPL exits. This allows us to experiment with the code without having to compile it. The Node.js REPL can be accessed from the command-line, or we can customize and create our own REPL environment using the repl module.