Read-Eval-Print Loop (REPL)

Read-Eval-Print Loop (REPL) image
Definition: An interactive programming environment that reads a single input, evaluates it, prints the result, then loops back to wait for the next input. It lets you run code a piece at a time rather than compiling and running a whole program.

So what? A REPL gives immediate feedback, which makes it handy for exploratory coding, quick debugging, and confirming how a snippet behaves before committing to it.

Examples: Typing node in a terminal to open the Node.js REPL and running expressions line by line; using Python's interactive shell to try a function before adding it to a test.
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