Ocaml Language

(** [keep_unique ls] filters out all duplicates, keeping only the *first* occurrence of the element in the list.

Example: [ keep_unique [1; 1; 2; 1; 3; 0] --> [1; 2; 3; 0] ] *)

start of the function will be like this. feel free to create helping function.

ls -> is a list

let rec keep_unique ls =