In general, this is an overrated topic of the software industry. "Functional Programming is Overrated" "Lambdas leading to unreadable code" 20 years later: "Function programming sucks" "Functional Programming is Overused by web developers let's stop it" "Functional programming considered harmful" "Functional programming considered harmful considered harmful" Hopefully we won't be reading that on Medium. Anyway, functional programming is overrated - its just procedural programming with a different style. I agree that Functional Languages are very useful, and yet, considered overrated. God I hate the term "code smell", but I can't think of anything more accurate. Unless you compare C++ and Object Pascal developers with Java and C# developers, and you see the difference. Object Oriented Programming (OOP) as an idea has been oversold. Find the first part here. As John points out, every single language has its zealots. OCaml unifies functional, imperative, and object-oriented programming under an ML-like type system. This can be extremely useful even thought many OOP Developers resent it so much. A Bit of Heresy: Functional Languages Are Overrated (2010) (benrady.com) ... (ML-style) functional programming does well, since it's basically a journal of a serious expert in object-oriented design learning switching over to the functional paradigm. This is the second part in a series I’m writing about lessons that can be learned from functional programming. greydius on Aug 3, 2016. Often times the less known the language the louder the zealots. So IMHO functional programming is not exactly declarative programming, but indeed functional languages are more declarative than procedural ones. Also, declarative systems are not overrated, but you need some dozen of years to develop them (read the mythical man month) Functional programming makes use of loose variables. Object-oriented programming (OOP) as an idea has been oversold. There are languages that are purposely designed to be bizarre. The most commonly used languages in use today are designed around the idea of OOP. I'm designing a high-level language & compiler to Whitespace in my spare time to learn about compiler construction, language design, and functional programming (compiler is being written in Haskell).. During the code generation phase of the compiler, I have to maintain "state"-ish data as I traverse the syntax tree. Software Architecture is an important topic, but it’s overrated. The most commonly-used languages in use today are designed around the idea of OOP. That said, "purity" in FP is a totally overrated concept IMHO. A few days ago I had a conversation with some friends of mine about software architecture and to be honest, I’m not a huge fan of this area. 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