An Xcode playground showcasing the new features in Swift 4.0. As seen in the What’s New in Swift session at WWDC 2017.
Written by Ole Begemann, May–September 2017.
See also: my What’s new in Swift 4.2 playground from 2018.
The playground requires Swift 4. Xcode 9 includes Swift 4 by default.
You can also run it in Xcode 8.3, but you need to install the latest Swift 4.0 snapshot from swift.org (don’t worry, it’s easy).
Hi,
With the WWDC 2017 in session 201 What's New in Cocoa Touch (21m01) Apple introduce a new block-base KVO.
Is not a pure Swift 4 feature 🤔 but it's may be interesting to mention on your playground 😉
The result of filteredSet example is missing. I added it.
If you updated the code for a more recent Swift toolchain, did you remember to also update the "Latest toolchain tested" date on the first page of the playground? That would be rad.
Thank you so much!
integer-protocols.png, referenced by the "New Integer Protocols" page is not displaying. I spent a few minutes trying tweaking the resource in the page but nothing causes it to display. I see it in the Resources folder. Is this just an Xcode 9 bug?
I am running 4.0-DEVELOPMENT-SNAPSHOT-2017-06-06-a of the Swift 4.0 snapshot and the commented out line was causing a crash in the playground giving the following error message.
error: simultaneous accesses to var 'numbers', but modification requires exclusive access; consider copying to a local variable
Thanks for the this playground! It's really handy.
looks like this should be String and Substring, not String and StringProtocol.
that line 12 edit wasn't manual, only notice it in this pull request. possible side effect of switching between raw and rendered markup.
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