REPL stands for Read Eval Print Loop. It specifies a computer environment like a window console or Unix/Linux shell where you can enter a command, and the computer responds with an output. It is very useful in writing and debugging the codes. REPL environment incorporates Node.js.
See the Example:
$ node
> 100 + 200
300
> 100 + ( 200 * 300 ) - 400
59700
>
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