The V8 JavaScript Engine
nodejs.dev/en/learn/the-v8-javascript-engine/
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JavaScript is internally compiled by V8 with just-in-time (JIT) compilation to speed up the execution.
V8 is the name of the JavaScript engine that powers Google Chrome. It's the thing that takes our JavaScript and executes it while browsing with Chrome. V8 provides the runtime environment in which JavaScript executes. The DOM and the other Web Platform APIs are provided by the browser.
V8 is written in C++, and it's continuously improved. It is portable and runs on Mac, Windows, Linux and several other systems.
JavaScript is generally considered an interpreted language, but modern JavaScript engines no longer just interpret JavaScript, they compile it.
Compilation JavaScript is generally considered an interpreted language, but modern JavaScript engines no longer just interpret JavaScript, they compile it.
V8 is the JavaScript engine i.e. it parses and executes JavaScript code. The DOM, and the other Web Platform APIs (they all makeup runtime environment) are provided by the browser. The cool thing is that the JavaScript engine is independent of the browser in which it's hosted.
In this new world, compiling JavaScript makes perfect sense because while it might take a little bit more to have the JavaScript ready, once done it's going to be much more performant than purely interpreted code.
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