using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{   

    public static void Main()

    {

        var resume = new Resume

        {

            Personal = new Personal

            {

                Name = "Olivier",

            },

            Experiences = new List<Experience>{

                new Experience{

                    Title = "Application Developer",

                    Date = new DateTime(2014,12,1),

                },

                new Experience{

                    Title = "Unemployed",

                    Date = DateTime.Now,

                },

            },

        };

        Console.WriteLine("Hello World, {0}", resume.Personal.Name);

        foreach(var exp in resume.ExperiencesByDate())

        {

            Console.WriteLine("Experience : " + exp.Title);

            Console.WriteLine("Number of a : " + exp.Title.HowManyA());

        }

        var nameList = new List<Namer>();

        nameList.Add(resume);

        foreach(var n in nameList)

        {

            Console.WriteLine(n.Name());

        }

        var f = new List<Func<int,int>>()

        {

            i => i*3,

            i => i+1,

            i => i^2,

        };

        Console.WriteLine(f[1](f[1](f[2](4))));

    }

    static string GiveMeMyName(string name)

    {

        return name;

    }

}

​

public interface Namer

{

    string Name();

}

​

public class Resume : Namer

{

    public Personal Personal {get; set;}

    public List<Experience> Experiences {get; set;} 

    public string Name()

    {

        return Personal.Name;

    }

    public IEnumerable<Experience> ExperiencesByDate(){

        return Experiences.OrderByDescending(s => s.Date);

    }

}

​

public class Experience

{

    public string Title {get;set;}

    public DateTime Date {get;set;}

}

​

public class Personal

{

    public string Name {get;set;}

}

​

public static class StringExtensions 

{

    public static int HowManyA(this string str)

    {

        return str.Count(c => new[] {'a','A'}.ToList().Contains(c));

    }

}