Editing Constructor (object-oriented programming) (section)

=== OCaml ===
In [[OCaml]], there is one constructor. Parameters are defined right after the class name. They can be used to initialize instance variables and are accessible throughout the class. An anonymous hidden method called <code>initializer</code> allows to evaluate an expression immediately after the object has been built.<ref>{{Cite web|url=https://ocaml.org/manual/5.3/index.html|title=OCaml - The OCaml Manual|website=ocaml.org}}</ref>

<syntaxhighlight lang="ocaml">
class person first_name last_name =
  object
    val full_name = first_name ^ " " ^ last_name

    initializer
      print_endline("Hello there, I am " ^ full_name ^ ".")

    method get_last_name = last_name
  end;;

let alonzo = new person "Alonzo" "Church" in (*Hello there, I am Alonzo Church.*)

print_endline alonzo#get_last_name (*Church*)
</syntaxhighlight>