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Swift 6.2 InlineArray and Span types for zero-overhead memory access, fixed-size collections, and safe pointer alternatives.
Passed 19 of 22 test cases with the skill, and 12 of 22 without it.
and 9 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.
Which version of the Swift compiler and standard library first introduced `InlineArray`, `Span`, `MutableSpan`, and `RawSpan`?
| Checked | Without skill | With skill |
|---|---|---|
| Identifies Swift 6.2 as the minimum version. | Missed | Passed |
The instructions your model reads when the skill loads.
Guidance for Swift 6.2's low-level memory types: InlineArray for fixed-size inline storage without heap allocation, and Span for safe, zero-cost access to contiguous memory. These replace common uses of UnsafeBufferPointer and hand-tuned tuple storage with compiler-checked alternatives.
Use this skill when the user:
let count: Int generic parametersWhat memory optimization do you need?
│
├─ A fixed-size collection that never grows/shrinks
│ │
│ ├─ Size known at compile time, stored on stack
│ │ └─ InlineArray<N, Element>
│ │ ├─ No heap allocation
│ │ ├─ No reference counting
│ │ └─ No copy-on-write (eager copies)
│ │
│ └─ Size may vary at runtime
│ └─ Array<Element> (standard library)
│
├─ Safe read access to contiguous memory
│ │
│ ├─ Read-only access to typed elements
│ │ └─ Span<Element>
│ │
│ ├─ Mutable access to typed elements
test cases passed, vs 12 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.