SelectMany is a fascinating operator in LINQ to Objects. For one thing, it is not as intuitive as most other LINQ operators. MSDN says that SelectMany “projects each element of a sequence to an IEnumerable(T) and flattens the resulting sequences into one sequence.” I still remember reading this description of SelectMany for the first time, […]
I was discussing the little LINQ puzzle with Stephen Toub, and he brought up an idea which lead to another puzzle. I like this one even more than the previous one. Why does the last line throw StackOverflowException? IEnumerable<int> q = new int[] { 1, 2 }; q = from x in new int[] { […]
Why does the last line hang? IEnumerable<int> empty = Enumerable.Empty<int>(); for (int i = 0; i < 40; i++) { empty = empty.Concat(empty); } int[] emptyArray = empty.ToArray(); Answer in the comments section. For a slightly harder challenge, check out the next puzzle.
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