Functional programming is the mustachioed hipster of programming paradigms. Originally relegated to the annals of computer science academia, functional programming has had a recent renaissance that is due largely to its utility in distributed systems (and probably also because “pure” functional languages like Haskell are difficult to grasp, which gives them a certain cachet).
Stricter functional programming languages are typically used when a system’s performance and integrity are both critical — i.e. your program needs to do exactly what you expect every time and needs to operate in an environment where its tasks can be shared across hundreds or thousands of networked computers.
Clojure, for example, powers Akamai, the massive content delivery network utilized by companies such as Facebook, while Twitter famously adopted Scala for its most performance-intensive components, and Haskell is used by AT&T for its network security systems. Read more
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