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JavaScript is based on the V8 engine used by Node.js and Chromium-based browsers. The engine tries to avoid parsing code that's not necessary right away. The optimized machine code can simply be re-used in order to speed things up. V8 is open source and has some great documentation on how it works under the hood.

JavaScript Visualized: the JavaScript Engine

V8 is an open-source JavaScript engine developed by Google for executing JavaScript code in web browsers and server-side environments. It is known for its high-performance, efficient memory management, and support for modern JavaScript features and optimizations. Readers can explore V8's architecture, optimizations, and performance characteristics, understanding how JavaScript engines work and how to optimize JavaScript code for better performance and compatibility across different platforms and environments.

Best of V8 — August 2022