using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        //Map = Select | Enumerable.Range(1, 10).Select(x => x + 2);

        //Reduce = Aggregate | Enumerable.Range(1, 10).Aggregate(0, (acc, x) => acc + x);

        //Filter = Where | Enumerable.Range(1, 10).Where(x => x % 2 == 0);

        Console.WriteLine("---map---");

        var map = Enumerable.Range(1, 10).Select(x => x+2);

        foreach(var item in map){

            Console.WriteLine(item);    

        }

        Console.WriteLine("---reduce---");

        var reduce = Enumerable.Range(1, 10).Aggregate(0, (acc, x)=> acc + x);

        Console.WriteLine(reduce);

        var reduceFact = Enumerable.Range(0, 5).Aggregate(1, (acc, x)=> acc + (x * acc));

        Console.WriteLine(reduceFact);

        Console.WriteLine("---filter---");

        var filter = Enumerable.Range(1,10).Where(x=>x %2 == 0);

        foreach(var item in filter){

            Console.WriteLine(item);    

        }

    }

}