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Learning OCaml: Printing Data Structures

If there’s one thing that frustrated me early on in my OCaml journey, it was printing stuff. In Ruby I can p anything and get a useful representation. In Clojure, prn just works on every data structure. In OCaml? There’s no generic print that works on any type – the type information is erased at runtime, so the language simply doesn’t know how to stringify an arbitrary value.

01 Mar 2026

Bozhidar Batsov

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