Reason · Reason позволяет писать простой, быстрый и качественный типизированный код, одновременно используя экосистемы JavaScript и OCaml.

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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 ++ "."
  };