/**
 * This function returns a copy of the array that you pass to it, but with all
 * duplicates removed.
 *
 * WARNING: If the array contains NaN, it will be removed.
 *
 * @example
 * unique(["apple", "apple", "banana", "cherry", "banana", NaN, NaN]);
 * // Returns ["apple", "banana", "cherry"]
 */
export default function unique(array: any[]): any[] {
  return array.filter((e: any, i: any, a: string | any[]) => {
    return a.indexOf(e) === i;
  });
}