How JavaScript works: inside the V8 engine + 5 tips on how to write optimized code ⚡️

A JavaScript engine is a program or an interpreter which executes JavaScript code. 🌀

A JavaScript engine can be implemented as a standard interpreter, or just-in-time compiler that compiles JavaScript to bytecode in some form. ✅


Why was the V8 Engine created❓

The V8 Engine which is built by Google is open source and written in C++. ✨

This engine is used inside Google Chrome. Unlike the rest of the engines, however, V8 is also used for the popular Node.js runtime.💎

V8 was first designed to increase the performance of JavaScript execution inside web browsers. 💨

In order to obtain speed, V8 translates JavaScript code into more efficient machine code instead of using an interpreter.💥

It compiles JavaScript code into machine code at execution by implementing a JIT (Just-In-Time) compiler like a lot of modern JavaScript engines do such as SpiderMonkey or Rhino (Mozilla). 🦊

The main difference here is that V8 doesn’t produce bytecode or any intermediate code. ❌


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[ Article ] : kutt.it/js-md2

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