export type Result<A, E> = { tag: "ok"; value: A } | { tag: "error"; error: E }

export const Result = {
  ok<A>(value: A): Result<A, never> {
    return { tag: "ok", value }
  },
  err<E>(error: E): Result<never, E> {
    return { tag: "error", error }
  },
  map<A, B, E>(result: Result<A, E>, f: (x: A) => B): Result<B, E> {
    switch (result.tag) {
      case "ok":
        return { tag: "ok", value: f(result.value) }
      case "error":
        return { tag: "error", error: result.error }
    }
  },
}