/// <summary>
/// Returns a random element of a sequence of elements, or a default value if no element is found.
/// </summary>
/// <typeparam name="TSource">The type of the elements of <paramref name="source"/>.</typeparam>
/// <param name="source">The <see cref="IEnumerable{T}"/> to return a random element of.</param>
/// <param name="randomizer">The function delegate that will select a random element of <paramref name="source"/>.</param>
/// <returns>default(TSource) if source is empty; otherwise, a random element of <paramref name="source"/>.</returns>
public static TSource RandomOrDefault <TSource>(this IEnumerable <TSource> source, Func <IEnumerable <TSource>, TSource> randomizer)
{
return(EnumerableUtility.RandomOrDefault(source, randomizer));
}
/// <summary>
/// Returns a random element of a sequence of elements, or a default value if no element is found.
/// </summary>
/// <typeparam name="TSource">The type of the elements of <paramref name="source"/>.</typeparam>
/// <param name="source">The <see cref="IEnumerable{T}"/> to return a random element of.</param>
/// <returns>default(TSource) if source is empty; otherwise, a random element of <paramref name="source"/>.</returns>
public static TSource RandomOrDefault <TSource>(this IEnumerable <TSource> source)
{
return(EnumerableUtility.RandomOrDefault(source));
}