They say that use exclamation marks when naming impure functions.
But I don't exactly understand the "impure" functions. Are they
- functions change state of their arguments (via reset!, alter, java-object-methods, ...)
- functions occur side-effect (for example, print, spit, ...)
- or both?
Obviously, official clojure apis don't have bang!s on every case above. I wonder when should I put them and need your help to make my code saner.