Data update

Task/Associative-array-Iteration/OCaml/associative-array-iteration-1.ml

@@ -0,0 +1,15 @@
+#!/usr/bin/env ocaml
+
+let map = [| ('A', 1); ('B', 2); ('C', 3) |] ;;
+
+(* iterate over pairs *)
+Array.iter (fun (k,v) -> Printf.printf "key: %c - value: %d\n" k v) map ;;
+
+(* iterate over keys *)
+Array.iter (fun (k,_) -> Printf.printf "key: %c\n" k) map ;;
+
+(* iterate over values *)
+Array.iter (fun (_,v) -> Printf.printf "value: %d\n" v) map ;;
+
+(* in functional programming it is often more useful to fold over the elements *)
+Array.fold_left (fun acc (k,v) -> acc ^ Printf.sprintf "key: %c - value: %d\n" k v) "Elements:\n" map ;;