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Swift 6.2 Approachable Concurrency — single-threaded by default, @concurrent for explicit background offloading, isolated conformances for main actor types.
Passed 19 of 22 test cases with the skill, and 12 of 22 without it.
and 8 more in the full report
8 fixed11 passed either way2 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.
When adding `@concurrent` to a static method in a class to offload work in Swift 6.2, what isolation keyword must be applied to the class definition itself?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies that the containing class must be marked `nonisolated`. | Missed | Passed |
The instructions your model reads when the skill loads.
Patterns for adopting Swift 6.2's concurrency model where code runs single-threaded by default and concurrency is introduced explicitly. Eliminates common data-race errors without sacrificing performance.
In Swift 6.1 and earlier, async functions could be implicitly offloaded to background threads, causing data-race errors even in seemingly safe code:
// Swift 6.1: ERROR
@MainActor
final class StickerModel {
let photoProcessor = PhotoProcessor()
func extractSticker(_ item: PhotosPickerItem) async throws -> Sticker? {
guard let data = try await item.loadTransferable(type: Data.self) else { return nil }
// Error: Sending 'self.photoProcessor' risks causing data races
return await photoProcessor.extractSticker(data: data, with: item.itemIdentifier)
}
}
Swift 6.2 fixes this: async functions stay on the calling actor by default.
// Swift 6.2: OK — async stays on MainActor, no data race
@MainActor
final class StickerModel {
let photoProcessor = PhotoProcessor()
test cases passed, vs 12 / 22 without
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