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See Douglas Crockford's opinion this subject: http://www.youtube.com/watch?v=dkZFtimgAcM http://www.youtube.com/watch?v=dkZFtimgAcM

• velis_vel 13y ago
  So I don't particularly feel like watching an entire hour-long video about something I'm already very familiar with for the sake of an argument on the internet; I'm just going to skim the video and look at the slides. He describes monads as "a loophole" in the idea of function purity. This isn't true; monads aren't a way to 'cheat' any more than passing an accumulator through like factorial acc 1 = acc factorial acc n = factorial (acc * n) (n - 1) is. He says something about state and functions and closures that I can't understand and how the state is 'always different', and it's just nonsense as far as I can tell. He also calls values 'monads', which isn't accurate terminology at all; they're usually called monadic actions.