> On Jan 11, 2018, at 7:55 PM, Kenny Leung via swift-users > <swift-users@swift.org> wrote: > > I’m trying to write a utility method that is kind of the opposite of “x ?? > y”, which means “x != nil ? x : y”. I want “x != nil ? f(x) : nil”
A good name for this method might be ‘map’ ;-) > This is not difficult to write, but if you have "f(x)->z" and "g(x)->z?", And a good name for this one might be ‘flatMap’. ;-) > I seem to need two versions of the function in order to handle it. Is there > any way to do this with only one function? I don’t think so; if this were possible, there probably wouldn’t be the two methods to do this in the standard library. Charles
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