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> It's commonly believed that a REPL is valuable and increases productivity

A REPL is a nice learning tool, but actually not that useful for productive programming. Go has a playground for learning and experimenting.



I do almost all of my most productive programming in a REPL (Python/JavaScript programmer here) and I have done for nearly 10 years now.


Depends on the language and the programmer. I find a properly configured REPL amazingly productive at nearly any point in a development life cycle.


You may not find it useful, but that doesn't mean it is a universal truth. I always have ghci open.




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