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But few real world app. is developed using racket compared with CL ?

It's true... I didn't search very hard, but I didn't find any "real world and/or big" apps written in Racket. [Edit: of course if we exclude Hacker News website, which is written in Arc, which is in turn written in Racket.] I think it's mainly because it is (or was) a Scheme - language almost universally thought to be very beautiful, very useful in education and completely useless in real world.

If I remember correctly breaking with this image was one of the reasons for name switch, but it was done rather recently (in 2010) and it will take some more time before Racket will get it's chance in the real world... Just how many years it took Haskell to convince people that it's something more than an obscure research project?

Certainly, the language would benefit greatly from much higher number of libraries, for example, and their lack can be a serious setback for larger projects. On the other hand the language itself includes many sophisticated, impressive features that help with programming such projects - one tiny example is a very nice module system, closer in essence (I think) to that of OCaml than to that of Python and another is an object system, which is well thought out, easy to use and really powerful.

So, while Racket is nowhere near Common Lisp (I really hope you used 'CL' as abbreviation for Common List and not Clojure :)) in industrial usage, I believe that it is (or will be shortly) ready for it's chance in the real world. It would take one or two moderately successful startups to build their products in Racket and open-source all the libraries they wrote to make Racket really viable alternative for other languages.

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