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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.
Records are one of those things that look almost identical across ML-family languages, so I didn’t expect many surprises when I started using them in OCaml. For the most part I was right – but there were a few things worth noting, especially if you’re coming from a language where records/structs are mutable by default.