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Yes, you can reload any symbol in the CLJ REPL directly from the editor. You can also evaluate any function within the context of the running application without going through the main. The REPL is an integral part of the development process in Clojure. You can see this in action here around 15 minute mark https://www.youtube.com/watch?v=nItR5rwP4mY

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R and RStudio are actually quite good in this aspect.

- You can evaluate any part of editor in console with keyboard shortcut. The only difference between using console and editor is that your input is easily saved in editor.

- The environment browser make inspecting variables, data structures much easier.

Besides, in R you want to use vectorized functions for better performance, so you search for general functions and combine them, which actually promote good functional programming style instead of a big control block with many processes intertwined.

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