In functional programming n Haskell functions are pure so there is no state just an input and an output. The exception is the IO entry point. There is a lot o

In functional programming n Haskell functions are pure so there is no state just an input and an output. The exception is the IO entry point. There is a lot of opportunity to sandbox things so that if you know the type of the function you know what it can or can't do to the programs state.