⚡ Bolt: [performance improvement] Prevent eager String allocation in is_truthy_env - #365
⚡ Bolt: [performance improvement] Prevent eager String allocation in is_truthy_env#365Lucenx9 wants to merge 1 commit into
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Replaced `value.to_lowercase()` with `value.eq_ignore_ascii_case()`
to prevent allocating a new String on the heap when comparing an
environment variable against known ASCII literals ("true", "yes", "1").
This optimizes what could be a hot path during environment variable
resolution in CLI hook events.
Co-authored-by: Lucenx9 <185146821+Lucenx9@users.noreply.github.com>
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| ## 2024-05-18 - [Optimize Truthy Check string allocation] | |||
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In this repo, AGENTS.md requires new top-level directories to be durable repo categories and keeps the repository shape predictable; adding .jules/bolt.md introduces tool-local metadata under a new top-level directory for a one-off optimization note. That leaves stale automation notes in source and makes the repo structure drift for future checkouts, so this generated file should be omitted from the commit.
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💡 What:
Replaced the
value.to_lowercase()call insideis_truthy_envwith direct calls toeq_ignore_ascii_caseon the borrowed string slice. Also updated the.map(...).unwrap_or(false)pattern to idiomatic.is_some_and(...).🎯 Why:
Calling
.to_lowercase()on a borrowed string eagerly allocates a brand newStringon the heap to store the lowercased result. Since we are only checking against known ASCII literals ("1", "true", "yes"), we can perform a case-insensitive match directly against the borrowed slice without allocating any memory at all. Environment variable checks often sit on hot paths during CLI setups, so eliminating unnecessary heap allocations is an easy win.📊 Impact:
Prevents a redundant O(N) heap allocation (where N is the length of the env var value) for every call to
is_truthy_env.🔬 Measurement:
Run
cargo benchif setup, or observe that unit tests continue passing identically while the generated assembly omitsString::new()paths.PR created automatically by Jules for task 14750373980336038321 started by @Lucenx9