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Added a section on functions, also Haskell (unlike Lisp) is category theory based rather than lambda calculus based.
'''Haskell''' is a pure [[functional programming languages|functional programming language]] with roots in the [[lambda calculus]]. Free and [[open source]] implementations are available for a variety of operating systems.
'''Haskell''' is a pure [[functional programming languages|functional programming language]] with roots in [[category theory]]. Free and [[open source]] implementations are available for a variety of operating systems.
==Functions in Haskell==
Functions are the most important idea in Haskell. A function takes a single value as input and returns a single value as output. Clearly it is often desirable to take in more than one argument or give out more than one. This can be done using [[tuples]] or [[lists]] but there is a very mathematically elegant and useful method called [[currying]], named for the logician Haskell Curry.
== Hello World ==
== Hello World ==