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Should structures always be immutable?

I read a couple of threads here about structures and there was / was one about structures and how they should represent immutable values ​​(for example, as a digit - 1) due to their behavior / semantics like value.

But, on the other hand, structures represent things like phone numbers that can change for the same household.

Is this a tough and quick rule?

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4 answers

The phone number does not change; you just get another and discard the old one. The old one is the same as always. The same goes for dates, numbers, etc. - think about it when approaching structures. This is a way to encapsulate a value that simply is; rather than using a value that changes.

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Yes, structures should always be unchanged! Variable structures can cause terrible headaches, as their use can create very strange behavior.

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Source: https://habr.com/ru/post/1733724/

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