Thanks for the pointers and advice. I'll have a look at these. > As far as separating implementation from interface, a fairly simple separation > is fields are implementation, methods are interface. While active bindings > allow encapsulated fields (often called "properties" > in other languages), it puts extra cognitive load on the user to remember > which state components are fields and which are returned by methods. Some > frameworks use properties to enable observation of mutable state (see the > objectProperties package on CRAN for doing this with reference classes). But > with reactivity in vogue, it's not clear whether the explicit observer > pattern is > still relevant. >
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