Co-Founder of CodeHS
A REPL stands for
Read
Evaluate
Loop
This is a type of programming loop that lets you continuously repeat reading a line of code inputted by a user, evaluate that line, and print out the evaluation.
Using a REPL can be a quick way to test out simple code and see how it evaluates.
Click Run to test it out
You can learn more about a REPL on this Wikipedia page
https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop
