using System;

using System.Diagnostics;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        string locate = "I Am Not Here";        

        var array = new string[] {"Not Me", "Wrong Again", "Find Me", "To Far" };

        DoWithLoop(locate, array, array);

        DoWithLinq(locate, array, array);

    }

    static void DoWithLoop(string locate, string[] searchThrough, string[] outputs) 

    {

        Console.WriteLine();

        Console.WriteLine("Using Loop...");

        var watch = new Stopwatch();

        string output = null;

        var index = -1;

        Console.WriteLine($"Arrays 'searchThrough' and 'outputs' has '{searchThrough.Length}' elements.");

        watch.Restart();

        for (var i = 0; i < searchThrough.Length; i++) 

        {

            // Console.WriteLine($"Checking index: {i}");

            if (!searchThrough[i].Equals(locate))

                continue;

            index = i;

            output = outputs[i];

            break;

        }

        watch.Stop();       

        WriteOutput(locate, index, output, watch);

    }

    static void DoWithLinq(string locate, string[] searchThrough, string[] outputs) 

    {

        Console.WriteLine();

        Console.WriteLine("Using Linq...");

        var watch = new Stopwatch();

        string output = null;       

        watch.Restart();

        //var index = searchThrough.ToList().FindIndex(s => s.Equals(locate));

        var index = Array.FindIndex(searchThrough, s => s.Equals(locate));

        output = index != -1 ? outputs[index] : null;

        watch.Stop();       

​

        WriteOutput(locate, index, output, watch);

    }

    static void WriteOutput(string locate, int index, string output, Stopwatch watch) 

    {

        Console.WriteLine($"Searching for: '{locate}'");

        Console.WriteLine($"Index is: '{index}'");  

        Console.WriteLine($"Output is: '{output}'");        

        Console.WriteLine($"It took: '{watch.ElapsedTicks}' ticks");        

    }

}