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By mswatcher
via strilanc.com
Submitted: Jun 23 2014 / 10:12

In software, it's common to have operations that only make sense when an object is in a particular state. For example, in a guess-how-many-jelly-beans-are-in-the-jar contest, you're typically not allowed to guess the same number as someone else. Also, there can't be a winner if no one has guessed. So if you write a class to handle that sort of contest, you naturally end up with code checking for those conditions:
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