Code Kata PickAkin

CodeKataPickAkin.cs

/*

http://ilker.de/code-kata-pickakin

akinList = [A1,B2,A2,A3,B3,A4,D1,D2,B1]
ceoList = [C1,E1,E2]
controlList = [F1]
*/

var ceoListOriginal = new List<string>() {"A1", "B1", "A2", "A3", "C1", "D1", "E1", "E2"};
var controlListOriginal = new List<string>() {"F1", "D2", "B2", "B3", "A4"};


var ceoListPart = (from ceo in ceoListOriginal
                    select ceo.Substring(0, 1));

var controlListPart = (from cl in controlListOriginal
                        select cl.Substring(0, 1));

var akinList =
    (from l in ceoListPart.Intersect(controlListPart)
        from o in ceoListOriginal
        where o.Substring(0, 1) == l
        select o)
        .Union
        (from l in ceoListPart.Intersect(controlListPart)
            from o in controlListOriginal
            where o.Substring(0, 1) == l
            select o)
        .ToList();

var ceoList = (from l in ceoListPart.Except(controlListPart)
                from o in ceoListOriginal
                where o.Substring(0, 1) == l
                select o)
    .ToList();

var controlList = (from l in controlListPart.Except(ceoListPart)
                    from o in controlListOriginal
                    where o.Substring(0, 1) == l
                    select o)
    .ToList();