Do you need to know how to do them so that you are ready for any requirement change?
Absolutely!
I would probably not do the Strings extraction here. At least, not until there is a feature on the top of backlog that requires it.
With the method extraction, I would probably leave it at the first level methods extraction (isFizz and isBuzz, without others). Again, until there is a feature that will make these other private methods handy.
As with any practice code, you want to take things to the max and extreme. You do that to see how things could be. And think when you would and would not do certain things (like I did in previous 2 paragraphs here).
Essentially, doing that expands your arsenal, when practicing and learning.
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This is scarily close to being overengineered, IMHO
I guess that is why I add at the end:
I would probably not do the Strings extraction here. At least, not until there is a feature on the top of backlog that requires it.
With the method extraction, I would probably leave it at the first level methods extraction (
isFizzandisBuzz, without others). Again, until there is a feature that will make these other private methods handy.As with any practice code, you want to take things to the max and extreme. You do that to see how things could be. And think when you would and would not do certain things (like I did in previous 2 paragraphs here).
Essentially, doing that expands your arsenal, when practicing and learning.