LAST CHANCE: Save 50% on all my Swift books and bundles! >>

Constrained existential types

Available from Swift 5.7

Paul Hudson      @twostraws

SE-0353 provides the ability to compose SE-0309 (“Unlock existentials for all protocols”) and SE-0346 (“Lightweight same-type requirements for primary associated types”) to write code such as any Sequence<String>.

It’s a huge feature in its own right, but once you understand the component parts hopefully you can see how it all fits together!

Hacking with Swift is sponsored by Essential Developer.

SPONSORED Join a FREE crash course for mid/senior iOS devs who want to achieve an expert level of technical and practical skills – it’s the fast track to being a complete senior developer! Hurry up because it'll be available only until July 28th.

Click to save your free spot now

Sponsor Hacking with Swift and reach the world's largest Swift community!

Other changes in Swift 5.7…

Download all Swift 5.7 changes as a playground Link to Swift 5.7 changes

Browse changes in all Swift versions

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.