LinqExtensions.cs

using UnityEngine;
using System.Linq;
using System.Collections.Generic;

public static class LinqExtensions {
	public static T Random<T>(this IEnumerable<T> list) {
		if (list != null && list.Any ())
			return list.ElementAt(UnityEngine.Random.Range(0, list.Count()));
		return default(T);
	}

	public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> source) {
		var list = source.ToList();
		list.Shuffle();
		return list;
	}

	public static void Shuffle<T>(this IList<T> list) {
		int count = list.Count;
		while (count > 1) {
			int i = UnityEngine.Random.Range(0, count - 1);
			T temp = list[count];
			list[count] = list[i];
			list[i] = temp;
		}
	}
}