Extensions with delegates

ExtensionsAndDelegates

class Program
{
    static void Main()
    {
        IEnumerable<string> names = new string[] { "Ireland", "Brazil", "Iceland" };

        foreach (var name in names.Filter(predicate: StringThatStartWithI))
        {
            Console.WriteLine(name);
        }
    }

    static bool StringThatStartWithI(string s)
    {
        return s.StartsWith("I");
    }
}

public static class MyExtensions
{
    public static IEnumerable<T> Filter<T>(this IEnumerable<T> input, Predicate<T> predicate)
    {
        foreach (var item in input)
        {
            if (predicate(item))
            {
                yield return item;
            }
        }
    }
}