Issue #69 11 May 2017
Written by: Jesse Squires
We’re less than a month away from WWDC. While the swift-evolution proposal train seems to finally be slowing down, it seems like the Swift team is just as busy as ever as the end of the Swift 4 release cycle approaches.
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- SR-4827: Incorrect result resolving type for Objective-C block
IndexPath.hashValuebroken on Linux
- SR-4824: Add tests to check Collection constraints are being enforced
Episode 10: The Variety Show
This week we discuss multi-line strings, reduce with inout, one-sided ranges, and more!
News and community
Sommer Panage discusses how to make writing UI code simpler with Swift in her talk, Writing Your UI Swiftly from try! Swift Tokyo 2017. The video was posted last month, but I’ve finally got around to watching it! It’s really great, I highly recommend it.
Nate Cook also gave a great talk, Swift’s Pointy Bits: Unsafe Swift & Pointer Types, at try! Swift Tokyo 2017. Nate explores and explains what “safety” really means in Swift. Again, this video isn’t extremely new, but I just watched it this week. Awesome talk.
Commits and pull requests
Ben Cohen added
Collection constraints via protocol where clauses requiring
SubSequence match the traversal. This resolved 8 ABI FIXMEs!
Robin Kunde merged diagnostic notes and fixits for confusable unicode characters.
Michael Ilseman implemented support for Unicode 9 grapheme breaking (i.e. emoji). Whatever that means. 😆
Jordan Rose opened a pull request to make all CoreFoundation types conform to
CFEqual as the implementation. This will be available in Swift 4, even when using “Swift 3 mode”.
Erik Eckstein merged changes to allow
Character literals that fit into 64 bits, be folded into a single integer constant. It makes character literals much faster (3x improvement for the CharacterLiteralsSmall benchmark) and it removes a lot of redundant code (~80% for the CharacterLiteralsSmall benchmark).
The proposal is accepted. Thank you to everyone who participated in the review!
The proposal is accepted for Swift 4. Thank you to everyone who participated in the review!
Ben Cohen pitched a draft proposal to add a
unicodeScalar view to
Character, similar to that on
Characterelement type of
Stringis currently a black box that provides little functionality besides comparison, literal construction, and to be used as an argument to
Many operations on String could be neatly/readily implemented as operations on each character in the string, if
Characterexposed its scalars more directly. Many useful things can be determined by examining the scalars in a grapheme (for example is this an ASCII character?).
And finally — ambiguous use of ‘abs’.