Haskell. Terse language means ide is not necessary and vim with your fave plugins does the trick nicely. No need for debugger as you can compose your program be

Haskell. Terse language means ide is not necessary and vim with your fave plugins does the trick nicely. No need for debugger as you can compose your program beautifully and test the last ounce of shit out of every little component using properly based testing.