Learn ELM with Real Code Examples
Updated Nov 20, 2025
Performance Notes
Elm-generated JavaScript is highly optimized
Immutable data structures reduce bugs but may need efficient updates for large apps
Compiler enforces best practices, avoiding runtime crashes
DOM updates are batched for performance
Avoid unnecessary re-rendering by using Elm's pure functions
Security Notes
Elm prevents common runtime exceptions
No null or undefined values; safer code
HTML injection attacks mitigated by compiler
Side effects controlled via Elm Runtime
Encourage safe interaction with JavaScript through ports
Monitoring Analytics
Track messages and state changes
Measure rendering performance
Log HTTP request outcomes
Test user interactions via subscriptions
Analyze UI responsiveness
Code Quality
Use elm-format for consistent code style
Write type-safe functions with explicit type annotations where needed
Modularize with small, reusable functions
Test Update functions thoroughly
Use compiler warnings to maintain safety