Learn SCALA with Real Code Examples

Prefer immutable collections for thread safety

Use tail recursion for optimized recursion

Minimize boxing/unboxing for primitives

Leverage parallel collections for data parallelism

Profile with JVM tools like VisualVM

Avoid unsafe reflection or dynamic class loading

Handle Option/Either to prevent NullPointerExceptions

Sanitize input for web apps and Spark jobs

Use secure libraries for encryption

Follow JVM security best practices

Use logging frameworks (Logback, SLF4J)

Monitor JVM metrics

Profile actor systems and Futures

Track application performance via dashboards

Use Scala profilers or Java profilers for bottlenecks

Follow Scala style guides

Use linters like Scalafix

Write unit and property-based tests

Document functions and classes

Profile and optimize performance-critical code