MVVM vs Bloc patterns

mvvm flutter bloc
niegus picture niegus · Mar 1, 2019 · Viewed 7.6k times · Source

I'm creating a new app with Flutter, and I'm trying to design it, separating the business logic from the view.

I've read about Bloc and MVVM (I know there are other patterns but these were the ones I preferred), but I don't understand the differences between them. They look pretty much the same to me.

Does anyone can help me understand them?

Answer

creativecreatorormaybenot picture creativecreatorormaybenot · Mar 1, 2019

Looking at this illustration for MVVM (source):

You can see that there are seperate data and business logic models. However, using BLoC there is not really a distinction like that. The classes that handle the business logic also handle the data, which can also apply to MVVM.

To be fair, there really is not much of a difference. The key part to take away is the same for both: Isolating the business logic from the UI. Hence, the implementation of either of the two will look very similar, i.e. using Stream's and StreamBuilder's.
Additionally, there are packages that make working with Stream's easier, e.g. rxdart which is what the Flutter team uses as far as I am concerned.

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