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How to think like a programmer.

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If a user is doing the test and writes "number[3|3]" because he learned that {0} is the default, the unittest failes. The user maybe astonished ;-)

The Sets section: assert listHalved.toSet.toList.head(3) equals list(0, 1, 2) Isn't this implementation specific? What guarantees that a list converted to a set and converted back to a list preserves the...