I’ve been enjoying learning ocaml, but I found it very easy to write code riddled with side effects and imperative-ness.
Take this example:
let some_func arg =
let input = format_input_from_stdin ()
let read_content = read_file "some/file/path.txt"
let to_write = get_write_file_content input read_content
let () = write_file "some/other/path.txt" to_write
let output = run_external_command_with_output
(output, read_content)
As you can see, many side effects and imperative steps in the code. Is there a better practice for coding this in a functional manner?
The way you can think of it is that in OCaml everything is implicitly wrapped in an IO monad. In Haskell the IO monad is explicit, so if a function returns something in IO you know it can perform input and output, in OCaml there is no way to tell just from the types. That means that in Haskell the code naturally stratifies into a part that does input and output and a pure core. In OCaml you can do the same thing, however it needs to be a conscious design decision.