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Use Phoenix for web applications

elixir

Phoenix for web apps. LiveView for interactive UIs without JavaScript. Channels for real-time. PubSub for broadcasting.

Use Phoenix LiveView for interactivity

elixir

LiveView for server-rendered reactive UIs. No JavaScript needed for most interactions. Use hooks for JS interop. Streams for large lists.

Use Java 21+ features

java

Virtual threads for scalable concurrency. Pattern matching for switch. Record patterns. Sequenced collections. Java 21 LTS minimum.

Use JUnit 5 for testing

java

JUnit 5 (Jupiter) for all tests. Use `@Test`, `@BeforeEach`, `@ParameterizedTest`. Mockito for mocking.

High in 7 rulesets

Use Maven or Gradle for builds

java

Gradle for flexibility, Maven for simplicity. Lock dependency versions. Use wrapper scripts (gradlew/mvnw).

Use Optional instead of null

java

`Optional<T>` for nullable returns. Never return null from methods. Use `@Nullable` annotations if needed.

Use async/await over callbacks and .then()

javascript

async/await for all async code. Easier to read, proper try/catch, works with loops.

High in 8 rulesets

Use const and let, never var

javascript

`const` by default, `let` for reassignment. Never `var` (hoisting bugs).

High in 8 rulesets

Use TypeScript for all new projects

javascript

TypeScript, not JS. Enable `strict: true`, `noImplicitAny`, `strictNullChecks`.

High in 8 rulesets

Use Kotlin idioms over Java patterns

kotlin

Data classes, extension functions, scope functions (let/apply/run). Null safety with `?` and `!!`.

Use Spring Boot 3+ features

spring

Spring Boot 3.x with Java 17+. Native compilation with GraalVM. Virtual threads support. Observability with Micrometer. Jakarta EE namespace.

Use Jest for JavaScript testing

testing

Jest for unit/integration tests. `describe`/`it` blocks. Mock with jest.mock(). Snapshot testing sparingly.

High in 14 rulesets

Medium

7 rules

Follow Java naming conventions

java

Classes: PascalCase. Methods/variables: camelCase. Constants: SCREAMING_SNAKE_CASE. Packages: lowercase.

Prefer immutability

java

Final fields, immutable collections. Use records for data classes (Java 16+). Builder pattern for complex objects.

Use Checkstyle for Java style

java

Checkstyle for style enforcement. Google or Sun conventions. Integrate with build (Maven/Gradle).

Use SpotBugs for Java bug detection

java

SpotBugs (FindBugs successor) for bug patterns. High-confidence issues only. Part of CI pipeline.

Use Spotless for Java formatting

java

Spotless for consistent formatting. Google Java Format or custom. `spotlessApply` before commit.

Use ESLint with strict configuration

javascript

ESLint + @typescript-eslint recommended rules. No `any`, no unused vars. Run in CI.

Medium in 9 rulesets