Data update

Task/Associative-array-Iteration/OCaml/associative-array-iteration-2.ml

@@ -0,0 +1,10 @@
+let map = Hashtbl.create 42;;
+Hashtbl.add map 'A' 1;;
+Hashtbl.add map 'B' 2;;
+Hashtbl.add map 'C' 3;;
+
+(* iterate over pairs *)
+Hashtbl.iter (fun k v -> Printf.printf "key: %c - value: %d\n" k v) map ;;
+
+(* in functional programming it is often more useful to fold over the elements *)
+Hashtbl.fold (fun k v acc -> acc ^ Printf.sprintf "key: %c - value: %d\n" k v) map "Elements:\n" ;;