Summary
Compilers and interpreters ultimately differ in "when translation happens."
- Compiler (AOT): Translate before execution. Fast but requires build. (C, Rust)
- Interpreter: Translate during execution. Slow but flexible. (Python, Ruby)
- JIT: Mix both advantages. Modern language standard. (Java, JavaScript, C#)
- LLVM: Modularized compilers, making new language development easier.
- WebAssembly: Native performance on the web.
- GraalVM: Breaking language barriers, enabling polyglot programming.
When I finally understood these concepts, I stopped thinking simply "this language is faster/slower." I started seeing what trade-offs each language chose to solve which problems.
C++'s complex build systems, Python's slow speed, JavaScript's weird type system—they're all consequences of deliberate design choices. And there are appropriate situations where each choice was correct.
Understanding this fundamentally changed how I approach programming language selection and performance optimization. It's not about finding the "best" language, but finding the right tool for each specific problem.