using System;

using System.Linq;

using System.Text;

using System.Diagnostics;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        // Remove empty spaces from start and end then remove first and last character from the string and then convert remaining string into uppercase

        // Func<string, string> mean that function takes a string input and provide string output

        var transformationPipeLine = new List<Func<string, string>>();

        transformationPipeLine.Add((input) => input.Trim());

        transformationPipeLine.Add((input) => input.Substring(1));

        transformationPipeLine.Add((input) => input.Substring(0, input.Length - 1));

        transformationPipeLine.Add((input) => input.ToUpper());

​

        var text = " 1Manish Jain0 ";

        var output = transformationPipeLine.Aggregate(text, (input, transform)=> transform(input));

        Console.WriteLine(output);

        var chars = Enumerable.Range(1,1000000).Select(i=>"S"+i).AsEnumerable();

        Stopwatch stopWatch = new Stopwatch();

        stopWatch.Restart();

​

        var csv1 = chars.Aggregate(new StringBuilder(), (a,b) => {   if(a.Length>0)  a.Append(","); a.Append(b); return a;});

        stopWatch.Stop();

        Console.WriteLine(stopWatch.Elapsed.TotalSeconds.ToString("f2") +" seconds = Aggregate w/ String Builder ");

        Stopwatch stopWatch1 = new Stopwatch();

        stopWatch1.Restart();

        Console.WriteLine("After Restart");

        var csv2 = string.Join(",",chars);

        Console.WriteLine("Before Stop");

        stopWatch1.Stop();

        Console.WriteLine(stopWatch1.Elapsed.TotalSeconds.ToString("f2") + " seconds = String.Join ");

    }

}