LowFile-scopeKotlin Plug & play

Optimize loops with early termination

Exit loops as soon as the goal is achieved using break/return or use any/find/count short-circuiting operations.

Why this matters

Reduces unnecessary work and improves clarity.

Side-by-side examples engineers can pattern-match during review.

Avoid

var found = false
for (x in xs) { if (x == target) { found = true } }

Prefer

val found = xs.any { it == target }

Bad

for (x in xs) { if (ok(x)) do(x) } // no break

Good

xs.firstOrNull(::ok)?.let(::do)

From the same buckets as this rule.

Critical
Avoid Blocking Calls to Async Methods
Blocking async methods with `.Result` or `.Wait()` can cause deadlocks and prevent efficient asynchronous execution. Use `await` instead for proper async behavior.
concurrency-safetyperformance-efficiency
Critical
Fingerprint assets and cache immutably
All static JS/CSS/font/image files MUST use content-hashed filenames (e.g., app.9c1a7b.js) and be served with "Cache-Control: public, max-age=31536000, immutable". HTML and other non-fingerprinted documents MUST be served with "Cache-Control: no-cache" (or equivalent) to enable conditional revalidation.
web-static-assetscaching-strategy+2
Critical
No live network or DB in unit tests—use fakes/mocks
Unit tests must stub or fake external HTTP/DB calls; allow real I/O only in integration/e2e tests tagged accordingly.
testing-qualityperformance-efficiency+1