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Haskell is most likely quite different from any language you've ever used before. Compared to the usual set of concepts in a programmer's mental toolbox, functional programming offers us a profoundly different way to think about software. In Haskell, we de-emphasise code that modifies data.
3 Functions. Since Haskell is a functional language, one would expect functions to play a major role, and indeed they do. In this section, we look at several aspects of functions in Haskell. First, consider this definition of a function which adds its two arguments: add :: Integer -> Integer -> Integer.