/// <summary>
/// Creates a shallow copy of the enumeration, scrambles and returns it.
/// </summary>
public static IEnumerable <T> Scramble <T>(this IEnumerable <T> items)
{
var itemsCopy = new List <T>(items);
for (var i = 0; i < itemsCopy.Count; i++)
{
var randomIndex = Randomness.GetRandomInt(0, itemsCopy.Count);
var temp = itemsCopy[randomIndex];
itemsCopy[randomIndex] = itemsCopy[i];
itemsCopy[i] = temp;
}
return(itemsCopy);
}
/// <summary>
/// Returns null if the enumeration has no elements.
/// </summary>
public static T GetRandomElement <T>(this IEnumerable <T> enumeration)
{
return(enumeration.ElementAtOrDefault(Randomness.GetRandomInt(0, enumeration.Count())));
}