[lqdc13]

Debugging poorly written or convoluted K programs is much more complicated than debugging equivalent C/C++/Java/Python programs.

It's decent for prototyping though, although I bet most people would prototype just as fast or faster in Python.

[RodgerTheGreat]

I'll grant that the debugging story for K isn't as sophisticated as with many other languages. Having a REPL and preferring programs that are mostly pure functions helps, but there's room for improvement. Tooling is about the community, though- not the language. I think that making documentation, screencasts and generally encouraging the expansion of K's open-source ecosystem will, with time, close that gap.