Associative array/Creation: Difference between revisions

==[[OCaml]]==

A simple idiom to create a hash table mapping strings to integers:

let hash = Hashtbl.create 0;;

List.iter (fun (key, value) -> Hashtbl.add hash key value)

["foo", 5; "bar", 10; "baz", 15];;

To retrieve a value:

let bar = Hashtbl.find hash "bar";; (* bar = 5 *)

To retrieve a value, returning a default if the key is not found:

let quux = try Hashtbl.find hash "quux" with Not_found -> some_value;;