Standard Library
Below is the API for the OCaml standard library. It's directly copied over from the OCaml Manual, formatted to the Reason syntax and styled accordingly. The API docs are work-in-progress; we'll be polishing these gradually!
If you're targeting JavaScript, the API docs for BuckleScript includes all of below, plus JS-specific APIs.
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 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 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 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 max_elt : Set.S.t -> Set.S.elt val choose : Set.S.t -> Set.S.elt 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 of_list : Set.S.elt list -> Set.S.t end