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

Reason
sig
 module type OrderedType =
  sig
   type t
   val compare : Set.OrderedType.t -> Set.OrderedType.t -> int
  end
 module type S =
  sig
   type elt
   type t
   val empty : Set.S.t
   val is_empty : Set.S.t -> bool
   val mem : Set.S.elt -> Set.S.t -> bool
   val add : Set.S.elt -> Set.S.t -> Set.S.t
   val singleton : Set.S.elt -> Set.S.t
   val remove : Set.S.elt -> Set.S.t -> Set.S.t
   val union : Set.S.t -> Set.S.t -> Set.S.t
   val inter : Set.S.t -> Set.S.t -> Set.S.t
   val disjoint : Set.S.t -> Set.S.t -> bool
   val diff : Set.S.t -> Set.S.t -> Set.S.t
   val compare : Set.S.t -> Set.S.t -> int
   val equal : Set.S.t -> Set.S.t -> bool
   val subset : Set.S.t -> Set.S.t -> bool
   val iter : (Set.S.elt -> unit) -> Set.S.t -> unit
   val map : (Set.S.elt -> Set.S.elt) -> Set.S.t -> Set.S.t
   val fold : (Set.S.elt -> 'a -> 'a) -> Set.S.t -> 'a -> 'a
   val for_all : (Set.S.elt -> bool) -> Set.S.t -> bool
   val exists : (Set.S.elt -> bool) -> Set.S.t -> bool
   val filter : (Set.S.elt -> bool) -> Set.S.t -> Set.S.t
   val filter_map : (Set.S.elt -> Set.S.elt option) -> Set.S.t -> Set.S.t
   val partition : (Set.S.elt -> bool) -> Set.S.t -> Set.S.t * Set.S.t
   val cardinal : Set.S.t -> int
   val elements : Set.S.t -> Set.S.elt list
   val min_elt : Set.S.t -> Set.S.elt
   val min_elt_opt : Set.S.t -> Set.S.elt option
   val max_elt : Set.S.t -> Set.S.elt
   val max_elt_opt : Set.S.t -> Set.S.elt option
   val choose : Set.S.t -> Set.S.elt
   val choose_opt : Set.S.t -> Set.S.elt option
   val split : Set.S.elt -> Set.S.t -> Set.S.t * bool * Set.S.t
   val find : Set.S.elt -> Set.S.t -> Set.S.elt
   val find_opt : Set.S.elt -> Set.S.t -> Set.S.elt option
   val find_first : (Set.S.elt -> bool) -> Set.S.t -> Set.S.elt
   val find_first_opt : (Set.S.elt -> bool) -> Set.S.t -> Set.S.elt option
   val find_last : (Set.S.elt -> bool) -> Set.S.t -> Set.S.elt
   val find_last_opt : (Set.S.elt -> bool) -> Set.S.t -> Set.S.elt option
   val of_list : Set.S.elt list -> Set.S.t
   val to_seq_from : Set.S.elt -> Set.S.t -> Set.S.elt Stdlib.Seq.t
   val to_seq : Set.S.t -> Set.S.elt Stdlib.Seq.t
   val to_rev_seq : Set.S.t -> Set.S.elt Stdlib.Seq.t
   val add_seq : Set.S.elt Stdlib.Seq.t -> Set.S.t -> Set.S.t
   val of_seq : Set.S.elt Stdlib.Seq.t -> Set.S.t
  end
 module Make :
  functor (Ord : OrderedType) ->
   sig
    type elt = Ord.t
    type t
    val empty : t
    val is_empty : t -> bool
    val mem : elt -> t -> bool
    val add : elt -> t -> t
    val singleton : elt -> t
    val remove : elt -> t -> t
    val union : t -> t -> t
    val inter : t -> t -> t
    val disjoint : t -> t -> bool
    val diff : t -> t -> t
    val compare : t -> t -> int
    val equal : t -> t -> bool
    val subset : t -> t -> bool
    val iter : (elt -> unit) -> t -> unit
    val map : (elt -> elt) -> t -> t
    val fold : (elt -> 'a -> 'a) -> t -> 'a -> 'a
    val for_all : (elt -> bool) -> t -> bool
    val exists : (elt -> bool) -> t -> bool
    val filter : (elt -> bool) -> t -> t
    val filter_map : (elt -> elt option) -> t -> t
    val partition : (elt -> bool) -> t -> t * t
    val cardinal : t -> int
    val elements : t -> elt list
    val min_elt : t -> elt
    val min_elt_opt : t -> elt option
    val max_elt : t -> elt
    val max_elt_opt : t -> elt option
    val choose : t -> elt
    val choose_opt : t -> elt option
    val split : elt -> t -> t * bool * t
    val find : elt -> t -> elt
    val find_opt : elt -> t -> elt option
    val find_first : (elt -> bool) -> t -> elt
    val find_first_opt : (elt -> bool) -> t -> elt option
    val find_last : (elt -> bool) -> t -> elt
    val find_last_opt : (elt -> bool) -> t -> elt option
    val of_list : elt list -> t
    val to_seq_from : elt -> t -> elt Seq.t
    val to_seq : t -> elt Seq.t
    val to_rev_seq : t -> elt Seq.t
    val add_seq : elt Seq.t -> t -> t
    val of_seq : elt Seq.t -> t
   end
end

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