I think Reagent would be the easiest and most visible example. Reagent was my intro to React, I had no experience prior nor did I care to learn it at the time.

I think Reagent would be the easiest and most visible example. Reagent was my intro to React, I had no experience prior nor did I care to learn it at the time. The reagent wrapper around react made it so intuitive to use that I was writing productive (albeit warty code because I had 0 experience with functional programming/lisp/clojure) my first day. I had loads of experience writing Javascript, but at that time React looked cryptic to me without reading any documentation and Reagent did not. Another commenter mentioned lodash. If I was forced to use JS directly, lodash would be the first thing I reach out for to solve problems. But in Clojure you also get "cljc" which is a file extension that lets you use code both in Clojure and Clojurescript land simultaenously. With this you can write things like form validation code that's exactly the same front and backend.