How is REPL used?

REPL is used for interactive programming and testing code snippets in real-time. Here’s how you can use REPL effectively:

1. Starting REPL: Open your terminal and type python or python3 to start the Python REPL. For JavaScript, you can use Node.js by typing node.

2. Entering Commands: You can type any valid command or expression directly into the REPL prompt. For example:

   >>> print("Hello, World!")
   Hello, World!

3. Evaluating Expressions: You can perform calculations or evaluate expressions:

   >>> 5 + 3
   8
   >>> 10 * 2
   20

4. Defining Functions: You can define functions and use them immediately:

   >>> def add(a, b):
   ...     return a + b
   ...
   >>> add(2, 3)
   5

5. Testing Code: REPL is great for testing small pieces of code, debugging, or learning new concepts without the need to create a full script.

6. Exiting REPL: To exit, you can type exit() or press Ctrl + D.

Using REPL allows for quick feedback and experimentation, making it a valuable tool for learning and development.