Question

I wrote the following code and I’m not able to understand how it is executed.

class Program
{
    static void Main(string[] args)
    {
        int[] nums = { 1, 5, 10, 3, 554, 34};
        var nn = nums.TakeWhile((n, junk) => n > junk);
        nn.Count();
        foreach (var a in nn)
        {
            Console.WriteLine(a);
        }
        Console.ReadKey();
    }
}

First I wrote the TakeWhile expression as n => n > 5. I’m able to understand that. But I just added one more parameter junk. What is junk here? What value is assigned to it during query exeution? How is it giving the output as 1, 5 and 10.

Answer 1

junk is the index of of the currently processed element – see http://msdn.microsoft.com/en-us/library/bb548775.aspx

Much more readable and understable would be

var nn = nums.TakeWhile((n, index) => n > index);