[swift-evolution] Brainstorming: Optional sugar inferred map

[Thorsten Seitz]

> Am 16.02.2016 um 05:52 schrieb Paul Ossenbruggen via swift-evolution <swift-evolution at swift.org>:
> 
> Currently it is possible to do this: 
> 
> a ?? doSomething(59)
> 
> it is not a huge stretch to allow the result of the left hand optional expression on the right hand side:
> 
> 	    a ?? doSomething($$)

Actually it *is* a huge stretch because it is just the opposite!
The second version is just `map` written with an operator where the rhs is only called for the case that a value is present, i.e. non-nil.
The first version covers the opposite case where the value is absent, i.e. is nil. 

-Thorsten 
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