The simplest solution is to define two extension methods, Head() and Tail(). In a previous article, we did this using Linq.
This article provides a similar solution, again using extension methods, but without using Linq.
var numbers = new[] { 1, 2, 3, 4, 5 };
var head = numbers.Head();
var tail = numbers.Tail();
Program output:
Head = 1
Tail = 2, 3, 4, 5The complete program
using System;
using System.Collections.Generic;
using System.Linq;
namespace Zuga.net
{
// Head & Tail Extension methods for Array<T>
public static class ArrayExtensions
{
public static T Head<T>(this T[] source)
{
if (source.Length == 0)
throw new InvalidOperationException();
return source[0];
}
public static T[] Tail<T>(this T[] source)
{
if (source.Length == 0)
return new T[] { };
var copy = new T[source.Length - 1];
Array.Copy(source, 1, copy, 0, copy.Length);
return copy;
}
}
class Program
{
static void Main(string[] args)
{
var numbers = new[] { 1, 2, 3, 4, 5 };
var head = numbers.Head();
var tail = numbers.Tail();
Console.WriteLine("Head = " + head);
Console.WriteLine("Tail = " + String.Join(", ", tail));
}
}
}