This is common when you are using façade design pattern. You use a façade to flatten and hide the internal composition of a composite object and present it as a single flat object. In some types of projects this comes up rather frequently. Both in client / UI programming and server side / business logic.
> On May 25, 2017, at 11:34 AM, Xiaodi Wu via swift-evolution > <swift-evolution@swift.org> wrote: > > Is it actually very common? In what sort of programming?
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