Compare Two Arrays Of Different Lengths and Show Differences

Question

Problem:
I have two arrays that can possibly be different lengths. I need to iterate through both arrays and find similarities, additions, and deletions.

Answer 1

You can use Except and Intersect ...

var Foo_Old = new[] { "test1", "test2", "test3" }; 
var Foo_New = new[] { "test1", "test2", "test4", "test5" };

var diff = Foo_New.Except( Foo_Old );
var inter = Foo_New.Intersect( Foo_Old );
var rem = Foo_Old.Except(Foo_New);

foreach (var s in diff)
{
    Console.WriteLine("Added " + s);
}

foreach (var s in inter)
{
    Console.WriteLine("Same " + s);
}

foreach (var s in rem)
{
    Console.WriteLine("Removed " + s);
}