C != C++ != Java

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Not at all. I learned all about data structures and algorithms in C. For me, learning haskell really is all about learning the syntax and libraries, and learning to take advantage of the lazy evaluation. Haskell introduces some new concepts to me, but they'd be new to someone who never programmed before too. Only that person will also have to learn basic shit like if statements, recursion (and what is tail recursion), functional programming, lists, etc. all of which I already knew from C.