Functor.cs

using System.Collections.Generic;

public class Functor {
	
  public static List<T> map<T> (System.Func<T, T> f, List<T> list) {
		List<T> newList = new List<T> ();
		foreach (var num in list) {
			newList.Add (f (num));
		}
		return newList;
	}
  
}