Imagine a universe without catch. In that universe, any exception bombs the whole runtime and your program terminates. This is, internally, pure.
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This is also why System.exit(0); is pure, ignoring the effects of SecurityManager. It seems bizarre, but it's true.
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I believe the first person to inform me that exception throwing is pure was
@boylanduwm. I didn't have a good example of it until@runarorama pointed out Task.attempt.Thanks. Twitter will use this to make your timeline better. UndoUndo
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