[swift-evolution] Add an ifPresent function to Optional

Andrey Tarantsov andrey at tarantsov.com
Sun Mar 20 12:32:45 CDT 2016

-0.5 in general, on the basis of me never encountering a good use case for it.

> let annotation: MKAnnotation? = ... // some optional annotation
> annotation.ifPresent(mapView.addAnnotation)

if let annotation = produceAnnotation() {

If annotation is a property...

if let annotation = annotation {


1) it's still not so bad.

2) If you have too much optional state within a class, you may want to consider extracting a helper class / struct that deals with it. IMO, too many different state lifecycles within a class is a code smell, we shouldn't mask it with ifPresent.

Would love to see some compelling real-world use cases, though — maybe I'm missing something.


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