Why Swift is introducing a warning for weak captures within nested closures🔒 SSL Verified

Table of Contents

• ↓ Recently published
• ↓ The main actor as a requirement
• ↓ Marking individual members instead
• ↓ Conclusion
• ↓ Picking an entry point
• ↓ Composition is key
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"Articles and podcasts about Swift development, by John Sundell."

"New in Swift 6.4 (which at the time of writing is in beta as part of Xcode 27) is a warning which is emitted when a nested closure performs a weak capture while the parent closure implicitly captures that object as a strong reference."

"At first glance, that new diagnostic could be a bit puzzling, since it might seem unnecessary to have to specify such a weak capture twice (or, alternatively, move it to the parent closure’s capture list), but it turns out that it’s an incredibly useful new warning that can help us avoid a quite common kind of memory management bug."

"Take the following code as an example. It performs a nested weak self capture within the closure passed to the call to loadNearbyFriends, while not (explicitly) capturing self at all within the parent closure:"

Key Topics & Focus Areas for swiftbysundell.com:

Recently published

The main actor as a requirement

Marking individual members instead

Conclusion

Picking an entry point

Composition is key