camlspotter avatar camlspotter committed 59b22df

added List.assoc_opt

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Files changed (2)

   aux []
+let assoc_opt k l = try Some (List.assoc k l) with Not_found -> None
 let scani_left f acc xs =
   let rec scan acc pos xs = match pos, xs with
     | _pos, [] -> acc
 val find_opt : ('a -> bool) -> 'a list -> 'a option
 val find_map_opt : ('a -> 'b option) -> 'a list -> 'b option
 val assoc_all : 'a -> ('a * 'b) list -> 'b list
+val assoc_opt : 'a -> ('a * 'b) list -> 'b option
 val filter_map : ('a -> 'b option) -> 'a list -> 'b list
 val rev_filter_map : ('a -> 'b option) -> 'a list -> 'b list
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