Reason · Reason lets you write simple, fast and quality type safe code while leveraging both the JavaScript & OCaml ecosystems.

type schoolPerson =
  | Teacher
  | Director
  | Student(string);
let greeting = person =>
  switch (person) {
  | Teacher => "Hey Professor!"
  | Director => "Hello Director."
  | Student("Richard") =>
    "Still here Ricky?"
  | Student(anyOtherName) =>
    "Hey, " ++ anyOtherName ++ "."
  };

type schoolPerson = Teacher | Director | Student(string);
let greeting = person =>
  switch (person) {
  | Teacher => "Hey Professor!"
  | Director => "Hello Director."
  | Student("Richard") => "Still here Ricky?"
  | Student(anyOtherName) => "Hey, " ++ anyOtherName ++ "."
  };