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copied!<ol> <li><p>Like the first time you went from imperative to object-oriented, working with functional programming requires a rewiring of how you think things out. The first time you tend to do things in a hybrid fashion until you get the gist of it all. Since you are coming from C# background, I would suggest trying F# as you are likely to get used to it much more quickly since the .net languages share a common framework which is good enough to get you started.</p></li> <li><p>That said going directly to Prolog and Haskell is not a bad idea but you might have to first adjust to the different syntax and libraries of the languages when compared to the leap between C# and F#. Personally, I went from C#/Java to Haskell by means of 2 books: <a href="http://book.realworldhaskell.org/read/" rel="noreferrer">RealWorldHaskell</a> and <a href="http://www.cs.kent.ac.uk/people/staff/sjt/craft2e/" rel="noreferrer">The Craft of Functional Programming</a>, and managed fine, so there is no reason for you not to be able to do so. :)</p></li> <li><p>Learning F# and then Haskell still requires some work because F# and Haskell are different: the first is "impure" while the second is "pure". Impurity means that certain "side-effects" such as state and IO are intrinsically allowed, while purity means that you don't get them immediately but have to use certain methods (such as monads). Coming from C# it would be perhaps easier to try F# and then Haskell cause of this.</p></li> <li><p>I believe (personal opinion warning), that if you want to become a better C# programmer, learning about F# and Haskell (or anything for that matter) can never hurt! Especially in the case of F# which can be integrated with C#. Functional programming may facilitate certain things for you and knowing it might become useful sooner or later especially since it seems, like the others said, that there is a current trend towards functional language programs.</p></li> </ol>

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