# \#wwdc **URL:** https://forums.swift.org/tag/wwdc/348.md [Latest](https://forums.swift.org/latest.md) · [Categories](https://forums.swift.org/categories.md) · [Tags](https://forums.swift.org/tags.md) --- ## [The Perfect Follow-Up to Dictionary Performance - mapKeyedValues (SE-0510)](https://forums.swift.org/t/the-perfect-follow-up-to-dictionary-performance-mapkeyedvalues-se-0510/87602)
**Author:** [@Okariuss](https://forums.swift.org/u/Okariuss)\ **Replies:** 3\ **Last updated:** [June 24, 2026, 1:21pm UTC](https://forums.swift.org/t/the-perfect-follow-up-to-dictionary-performance-mapkeyedvalues-se-0510/87602 "2026-06-24T13:21:05Z")
Before WWDC26, I published an article called “Advanced Dictionaries: Performance and Hidden Traps.” In that article, I explained why mapValues(\_:) is very fast because it reuses the same hash structure and memory slots. … --- ## [Understanding Iterable (WWDC26)](https://forums.swift.org/t/understanding-iterable-wwdc26/87538)
**Author:** [@Okariuss](https://forums.swift.org/u/Okariuss)\ **Replies:** 2\ **Last updated:** [June 22, 2026, 8:52am UTC](https://forums.swift.org/t/understanding-iterable-wwdc26/87538 "2026-06-22T08:52:32Z")
Hi everyone, After watching the WWDC26 What's New in Swift session, I wanted to learn more about Swift's ownership system. I did some research on SE-0516 and the new Iterable protocol, and I wrote an article about it. I… --- ## [Quick look at Ref and MutableRef in Swift 6.4 (WWDC26)](https://forums.swift.org/t/quick-look-at-ref-and-mutableref-in-swift-6-4-wwdc26/87397)
**Author:** [@Okariuss](https://forums.swift.org/u/Okariuss)\ **Replies:** 0\ **Last updated:** [June 15, 2026, 6:11pm UTC](https://forums.swift.org/t/quick-look-at-ref-and-mutableref-in-swift-6-4-wwdc26/87397 "2026-06-15T18:11:21Z")
Hi everyone, Following the updates from WWDC26, I researched the new Ref and MutableRef types in Swift 6.4. These tools allow us to work with stack values safely without heap allocations. I wrote a short technical post… --- ## [Exploring borrow and mutate in Swift 6.4: Hands-on Project & Performance Insights](https://forums.swift.org/t/exploring-borrow-and-mutate-in-swift-6-4-hands-on-project-performance-insights/87353)
**Author:** [@Okariuss](https://forums.swift.org/u/Okariuss)\ **Replies:** 2\ **Last updated:** [June 13, 2026, 6:04pm UTC](https://forums.swift.org/t/exploring-borrow-and-mutate-in-swift-6-4-hands-on-project-performance-insights/87353 "2026-06-13T18:04:52Z")
Hi everyone, After watching the WWDC26 sessions and diving into the recent ownership proposals, I wanted to test these concepts in practice using the Swift 6.4 Beta. I built a hands-on project to experiment with borrow… --- ## [Envision WWDC26 — A Global Online WWDC Week Community-driven events for visionOS and Swift Builders](https://forums.swift.org/t/envision-wwdc26-a-global-online-wwdc-week-community-driven-events-for-visionos-and-swift-builders/86044)
**Author:** [@JiaxuLi](https://forums.swift.org/u/JiaxuLi)\ **Replies:** 0\ **Last updated:** [April 15, 2026, 2:33pm UTC](https://forums.swift.org/t/envision-wwdc26-a-global-online-wwdc-week-community-driven-events-for-visionos-and-swift-builders/86044 "2026-04-15T14:33:26Z")
:rocket: Envision WWDC26 is coming :soon\_arrow: Envision WWDC26 is an independent, global online community event running alongside WWDC from June 8–12, 2026 (PT) :globe\_showing\_europe\_africa: :man\_technologist:t2:Web… --- ## [C annotations \`counted\_by\` and \`noescape\` not producing Span consuming function signatures](https://forums.swift.org/t/c-annotations-counted-by-and-noescape-not-producing-span-consuming-function-signatures/83333)
**Author:** [@craigwrong](https://forums.swift.org/u/craigwrong)\ **Replies:** 3\ **Last updated:** [November 21, 2025, 3:42pm UTC](https://forums.swift.org/t/c-annotations-counted-by-and-noescape-not-producing-span-consuming-function-signatures/83333 "2025-11-21T15:42:35Z")
Hello again :waving\_hand: I’m trying to introduce memory safety to my Swift project which integrates some C functions. For this I referred to this WWDC session Unfortunately the \_\_noescape annotation is not being recog… --- ## [Incremental Build and LSP Updates](https://forums.swift.org/t/incremental-build-and-lsp-updates/81778)
**Author:** [@shoplab](https://forums.swift.org/u/shoplab)\ **Replies:** 2\ **Last updated:** [August 29, 2025, 10:10am UTC](https://forums.swift.org/t/incremental-build-and-lsp-updates/81778 "2025-08-29T10:10:25Z")
In some of the WWDC videos, I believe there was mention of upcoming improvements to the VSCode extension and LSP, particularly around better support for incremental builds. Did I understand that correctly? And if so, are… --- ## [WWDC 2020 - Ready. Set. Code](https://forums.swift.org/t/wwdc-2020-ready-set-code/36178)
**Author:** [@SwiftUI](https://forums.swift.org/u/SwiftUI)\ **Replies:** 7\ **Last updated:** [May 5, 2020, 6:40pm UTC](https://forums.swift.org/t/wwdc-2020-ready-set-code/36178 "2020-05-05T18:40:31Z")
\[WWDC 2020\] (https://developer.apple.com/wwdc20/) On June 22, WWDC20 takes off. Get ready for the first global, all-online WWDC by downloading the Apple Developer app to stay notified on all the latest news, with update…