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.
module Sort: sig .. endArray and List should be used instead.
   The new functions are faster and use less memory.val list : ('a -> 'a -> bool) -> 'a list -> 'a listtrue if its first argument is
   less than or equal to its second argument.val array : ('a -> 'a -> bool) -> 'a array -> unittrue if its first argument is
   less than or equal to its second argument.
   The array is sorted in place.val merge : ('a -> 'a -> bool) -> 'a list -> 'a list -> 'a listmerge returns a sorted list containing the elements
   from the two lists. The behavior is undefined if the two
   argument lists were not sorted.