What is REPL? (Ctrl + Shift + I > console)

REPL (Read-Eval-Print Loop) is an interactive programming environment where you can run JavaScript (or other languages) line by line and see the results immediately.

Breaking it down:

1. Read → Takes your input (a JavaScript command).
2. Eval → Evaluates (executes) the command.
3. Print → Displays the result.
4. Loop → Repeats the process for the next command.

Example in JavaScript (Node.js REPL)

1. Open your terminal and type:

   node

2. You’ll enter the Node.js REPL (interactive mode). Try this:

   2 + 3;

   Output:

   5

3. You can also define variables and functions:

   let name = "Rahul";
   console.log("Hello, " + name);

   Output:

   Hello, Rahul

Why is REPL useful?

• Quick testing of JavaScript code.
• Debugging small code snippets.
• Learning and experimenting with JavaScript without creating a file.