Discussion on "Demeter's Law: Don't talk to strangers!"

Carlos Caballero · 2019-07-17T08:06:37.408Z

The Law of Demeter (LoD) or principle of least knowledge is a design guideline for developing software, particularly object-oriented programs — Wikipedia* This law was proposed by Ian Holland in 1987 when he and his colleagues were programming a sys...

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I've tried to be really strict about this for a little while, but I found that in some cases it's just too hard and not really worth the effort.

Have others had the same experience?

I still think it's a good guideline, but I consider it more a "Guideline of Demeter" than "Law of Demeter".

Famous example, is accessing the pages of a book through the book reference really a problem? It's not really an "implementation detail", it's just how books work, shouldn't it be considered part of the API?

Hi!

In computer science the laws are dangerous. In my opinion, each law/technique should be taken as an advise.

Thanks

At least, laws and "best practices" are a reasonable starting point \ safe assumption. But there are certainly cases where "best practices" are abused. Don't repeat yourself is one of the worst offenders in my book. Please don't wire EVERYTHING together. O_o Obviously, config \ and settings + constants shouldn't be repeated everywhere. But the number of classes I have seen cobbled together into a super class, in the spirit of DRY. old man grunt

Carlos Caballero Joseph S Stevens Yeah they're not inviolable Laws of Nature. But some apply more generally than others.

The subset of the Guideline of Demeter that I do adhere more strictly to is to not mutate fields of members of members (or really, it's on the object to not expose things that can mutate their internals).

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Demeter's Law: Don't talk to strangers!

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