OCaml is practical multiple paradigm language, and this language is widely used.
For example, Jane Street/Facebook uses this.
And its varaint ReasonML/Rescript is popular, too.
Also codefoces/hackerrank support this language.
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I personally would be very interested in this. I’ve been looking to build some practical things with OCaml and codecrafters support would be welcome.
I’m working on OCaml support this week 
We’ll likely start with the Interpreter & Redis challenge (the ones with the most stages) and then expand from there based on demand.
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Support for Interpreter & Redis is now live! OCaml track is now in beta! - #2 by rohitpaulk