c# switch expression call methods code example

Example: new in c# switch expression

public static T ExhaustiveExample<T>(IEnumerable<T> sequence) =>
    sequence switch
    {
        System.Array { Length : 0}       => default(T),
        System.Array { Length : 1} array => (T)array.GetValue(0),
        System.Array { Length : 2} array => (T)array.GetValue(1),
        System.Array array               => (T)array.GetValue(2),
        IEnumerable<T> list
            when !list.Any()             => default(T),
        IEnumerable<T> list
            when list.Count() < 3        => list.Last(),
        IList<T> list                    => list[2],
        null                             => throw new ArgumentNullException(nameof(sequence)),
        _                                => sequence.Skip(2).First(),
    };