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⚡ Bolt: [performance improvement] Optimize string concatenation in Casing::Pascal #49

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⚡ Bolt: [performance improvement] Optimize string concatenation in Casing::Pascal #49

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3 changes: 3 additions & 0 deletions .jules/bolt.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
## 2026-05-14 - [Intermediate Allocations]
**Learning:** String concatenation using `.collect::<Vec<_>>().join("")` creates unnecessary intermediate allocations compared to `.collect::<String>()`.
**Action:** Always prefer `.collect::<String>()` for iterator-based string building.
8 changes: 3 additions & 5 deletions xdk-lib/src/casing.rs
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Expand Up @@ -29,11 +29,9 @@ impl Casing {
result
}
}
Casing::Pascal => words
.iter()
.map(|w| pascal_case(w))
.collect::<Vec<_>>()
.join(""),
// Bolt: optimize string concatenation by directly collecting into a String
// to avoid intermediate Vec allocations.
Casing::Pascal => words.iter().map(|w| pascal_case(w)).collect::<String>(),
Casing::Kebab => words.join("-").to_lowercase(),
Casing::ScreamingSnake => words.join("_").to_uppercase(),
}
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