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Use the [state] tag for questions pertaining to retained information determining the behavior of a program.

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Why is Global State so Evil?

If the state is passed in and changes to the state are local to the code block, then you can pass in any state you like (if it's the correct data type) and have your code process it. … If you pass state into a code block then that code block can exist in isolation, that isn't the case if you rely on global state. …
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