I can assure you that, with practice, Haskell can be a very practical language. Having IO in the types lets one reason about where the effects are happening, wh

I can assure you that, with practice, Haskell can be a very practical language. Having IO in the types lets one reason about where the effects are happening, which is especially important when trying to solve real world problems with functional techniques (i.e. transforming unreliable streams of data).