LINQ 4th (skipwhile and takewhile)

The example in the book is normal, so I wrote something abnormal.

This is what I wrote.

    class Program    {        static void Main(string[] args)        {            int[] mn = { 1,2,3,4,5,6,7,8,9};            var z = mn.TakeWhile((x, i) => i < 5);            foreach(var x in z)            {                Console.WriteLine(x);            }            Console.ReadLine();        }    }

The result is
1

2

3

4

5

I changed I <5 to I> 5, so there is no output.

The high person reminds me that I is index and X is the value.

Some people said:

When the first value is determined, if the returned value is false, skipwhile/takewhile is terminated.

Note: Both takewhile and skipwhile execute actions based on the concept of while.

 

Then, I understand...

    class Program    {        static void Main(string[] args)        {            int[] mn = { 1,2,6,3,4,5,6,7,8,9};            var z = mn.TakeWhile((x, i) => i< 5);            foreach(var x in z)            {                Console.WriteLine(x);            }            Console.ReadLine();        }    }

View code

 

Running result

 

    class Program    {        static void Main(string[] args)        {            int[] mn = { 1,2,6,3,4,5,6,7,8,9};            var z = mn.TakeWhile((x, i) => x<5);            foreach(var x in z)            {                Console.WriteLine(x);            }            Console.ReadLine();        }    }

View code

 

What is output?

 

 

1

2

It's amazing ~