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Prolog is the poster child for declarative languages. To some extent SQL and Excel fall into declarative language camp. Functional programming is as you say us

• Dewie 12y ago
  Yeah, prolog. The declarative language where you just specify what you want, and still have to learn the underlying unification algorithm to use it[1], and sprinkle very procedural cuts around your code in order to keep the algorithm from taking unnecessary paths. > Functional programming is as you say using functions and avoiding side effects. See Haskell, see ML, see LISP, I do not see declarative languages among them. Heh, so you're saying that functional programming is not declarative because it is not prolog et al.? No, functional programming is also considered a declarative style of programming. It doesn't matter that it isn't logical programming, or excel. (If you think this argument is a bit just-so, well it's a reply to the same style of "argument". If you want to claim that FP is not declarative, please argue why it is not declarative.) [1] Which is often more effort to learn compared to the conceptual evaluation model of FP, since the FP evaluation model can often be viewed as a more restricted version of evaluation used in imperative languages.