C# is actually pretty good

Posted on July 29, 2007

C# 3.0 has some really good good featurs, with liberal use of generics, language integrated queries (LINQ), lamda expressions and closures, we can make it look like Ruby or some functional language:

 

public static class CommonExtensions

{

    public static Action<Action<int>> LoopTo(this int start, int end)

    {

        return new Action<Action<int>>(action => To(start, end).ForEach(i => action(i)));

    }

    public static IEnumerable<int> To(this int start, int end)

    {

        if (end < start)

            for (int i = start; i > end - 1; i–)

                yield return i;

        else

            for (int i = start; i < end + 1; i++)

                yield return i;

    }

    public static void ForEach<T>(this IEnumerable<T> sequence, Action<T> action)

    {

        foreach (T item in sequence) action(item);

    }

    public static void PrintLine(this object o)

    {

        Console.WriteLine(o);

    }

}

So now we could try and do this….

 

// ruby

(10..20).each { |i| puts i }

// C#

10.LoopTo(20) ( i => i.PrintLine() );

(example from BitterCoder blog)

C# 3.0
customers.Where(c => c.IsActive == true).Each(c => c.OutputToConsole());

C# 3.0
customers.Where(c => c.IsActive == true).Each(c => c.OutputToConsole());
C# 2.0
foreach(Customer c in customers)
{
if(c.IsActive)
System.Console.WriteLine(c.ToString());
}

Functional programming is dead right? ;-)

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