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

Reason
sig
 type ('a, 'e) t = ('a, 'e) Stdlib.result = Ok of 'a | Error of 'e
 val ok : 'a -> ('a, 'e) Stdlib.result
 val error : 'e -> ('a, 'e) Stdlib.result
 val value : ('a, 'e) Stdlib.result -> default:'a -> 'a
 val get_ok : ('a, 'e) Stdlib.result -> 'a
 val get_error : ('a, 'e) Stdlib.result -> 'e
 val bind :
  ('a, 'e) Stdlib.result ->
  ('a -> ('b, 'e) Stdlib.result) -> ('b, 'e) Stdlib.result
 val join :
  (('a, 'e) Stdlib.result, 'e) Stdlib.result -> ('a, 'e) Stdlib.result
 val map : ('a -> 'b) -> ('a, 'e) Stdlib.result -> ('b, 'e) Stdlib.result
 val map_error :
  ('e -> 'f) -> ('a, 'e) Stdlib.result -> ('a, 'f) Stdlib.result
 val fold :
  ok:('a -> 'c) -> error:('e -> 'c) -> ('a, 'e) Stdlib.result -> 'c
 val iter : ('a -> unit) -> ('a, 'e) Stdlib.result -> unit
 val iter_error : ('e -> unit) -> ('a, 'e) Stdlib.result -> unit
 val is_ok : ('a, 'e) Stdlib.result -> bool
 val is_error : ('a, 'e) Stdlib.result -> bool
 val equal :
  ok:('a -> 'a -> bool) ->
  error:('e -> 'e -> bool) ->
  ('a, 'e) Stdlib.result -> ('a, 'e) Stdlib.result -> bool
 val compare :
  ok:('a -> 'a -> int) ->
  error:('e -> 'e -> int) ->
  ('a, 'e) Stdlib.result -> ('a, 'e) Stdlib.result -> int
 val to_option : ('a, 'e) Stdlib.result -> 'a option
 val to_list : ('a, 'e) Stdlib.result -> 'a list
 val to_seq : ('a, 'e) Stdlib.result -> 'a Stdlib.Seq.t
end

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