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How JavaScript Compilation Works
- JavaScript is widely used programming language and historically was an interpreted language, meaning that the browser would read and execute JavaScript code line by line.
- With the evolution of modern JavaScript engines, the process has shifted toward compilation and optimization.
- JavaScript sits in the middle ground between interpreted and compiled languages.
- JavaScript compilers are part of what is called a JavaScript engine, and each browser has its own JavaScript engine.
- JavaScript engines implement the ECMAScript standard which defines how JavaScript should behave.
- The first step in the compilation process is parsing, which breaks down the code into an Abstract Syntax Tree (AST).
- After building AST, the engine converts it into an Intermediate Representation(IR) which helps to apply various optimizations before final execution.
- Modern JavaScript engines use a technique called Just-In-Time (JIT) compilation to optimize performance.
- JavaScript engines manage memory automatically through a process known as garbage collection.
- Understanding how these engines work gives developers insight into writing more efficient, optimized code.
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