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    Fast or elegant. Writing Java in Clojure for higher performance is meh. This is what we get when trying to use a too high level of abstraction. It is really good that we have a simple way to observe performance and fix the bottlenecks though.

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      The reality is that idiomatic Clojure without any optimizations is fast enough for vast majority of situations. Clojure is already significantly faster than a lot of popular languages like Ruby or Python out of the box. So, the amount of times you actually need to do these kind optimizations is pretty rare in most domains Clojure is used. However, having the ability to tweak performance to this level is really handy when you do end up in a scenario where that’s needed. I’m very much a fan of writing code with maintainability in mind as the primary concern, and optimizing things on case by case basis as the need arises. Clojure is hands down one of the best languages I’ve used in this regards.

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        Clojure is already significantly faster than a lot of popular languages like Ruby or Python out of the box.

        Any sources, if you don’t mind my asking?

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          Totally anecdotal, but my rewrite of the Riemann monitoring system from Ruby to Clojure improved throughput by something like two orders of magnitude right off the bat, and that was the first thing I ever wrote in Clojure. With a little work, we went from ~700 events/sec (in ruby) to ~10 million events/sec per node. Not an apples-to-apples comparison there–that’s years of optimization, batching and network tricks, and different hardware, but like… coming from MRI, the JVM was a game changer.

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            Here’s a post from AppsFlyer discussing a significant performance boost when we moving from Python to Clojure.

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          I completely agree with you. My only problem is that is very hard to sell Clojure to people. Both clients and co-workers. Clojure and F# are the two default languages I use a lot for writing code for myself. Unfortunately team mates and clients force me to use Python, TS, C#, etc.

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            My team’s been using Clojure for close to a decade now, and what I observed over that time is that developers experienced in imperative style often have a hard time getting into FP. Yet, when my team hires students who have little to no programming experience, they’re able to pick up Clojure very quickly and tend to love the language.

            I think the big problem is with mismatched expectations. People build up a set of transferable skills that allow them to quickly move from one language to another as long as those languages are within the same family. If you learn a language like Ruby then you can quickly pick up Python, Js, or Java. You’ll have to learn a bit of syntax and libraries, but how you approach code structure and solve problems remains largely the same.

            However, using a language like Clojure or F# requires a whole new set of skills that you wouldn’t pick up working with imperative languages. People tend to confuse this with FP being inherently more difficult as opposed to just being different.