12 Swift 6.4 Features, Ranked by How Useful They Are
Every year Apple’s “What’s new in Swift” session drops thirty minutes of language features, and every year the recaps list them in the order they appeared on stage. That order is optimized for a keynote, not for your sprint.
This one is sorted differently. The question for every feature is the same: how far is it from a diff I can open tomorrow? Some of these are one-line changes that delete a hack you’ve been apologizing for since 2021. Others are powerful, well-designed, and will not touch your app code for a year. Both deserve to be understood. Only one deserves a ticket.
One thing to fix in your mental model before we start: this year’s session covers two releases, Swift 6.3 and 6.4. Some of what follows is already in your toolchain.
Each feature gets three lines: Lands in, Reach for it when, and a Verdict...
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