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Great playground. I would really like to see the proper / your solution to the second combined exercise, because I think I cheated a bit in my solution, and I cannot think of a better way to solve it. Maybe it would be a good idea in general to show solutions to the exercises after they are solved, as there are often multiple ways to solve a task, and seeing an alternative solution might be beneficial.
I should probably update this course with the new "spoiler" construct that tech.io recently added. In the meantime, though, you can see all my solutions in the github. All exercises are unit tested, and have a solution in the repository. This particular one is at:
All the time i think lambda expressions must be declared and used inside a method. I think that because it shortness
where is "Run My Code" button in Lambda expressions examples before Exercise section?
Layout issue in Firefox: http://i.imgur.com/hxEmCqV.png
Thanks for the report, it should be fixed in a few minutes