JIT Compilation
JIT (Just-In-Time) compilation is a technique where code is compiled into machine instructions at runtime, rather than ahead of time. It dynamically translates bytecode or intermediate representations into native code during program execution, enabling optimizations based on actual usage patterns. This approach balances the flexibility of interpretation with the performance benefits of compilation.
Developers should learn JIT compilation when working with performance-critical applications in languages like Java, C#, or JavaScript, as it can significantly speed up execution by optimizing hot code paths. It's essential for understanding modern runtime environments such as the JVM, .NET CLR, or V8 engine, where it reduces startup time and adapts to dynamic workloads. Use cases include web browsers, server-side applications, and game engines where real-time optimization is crucial.