Uploaded June 2026 | Updated September 2026, 3 weeks ago
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![JavaScript Under The Hood [5] - JavaScript Engine Overview](https://i.ytimg.com/vi/oc6faXVc54E/mqdefault.jpg "JavaScript Under The Hood [5] - JavaScript Engine Overview
In this final video of the series, we will talk about JS engines and look at how JavaScript code is turned into machine code that runs on the CPU.
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Timestamps:
0:00 - Intro
0:42 - What is a JS Engine?
1:31 - Specific Browser Engines
3:30 - Compiled vs Interpreted Languages
6:11 - JS Engine Process Overview
7:25 - Abstract Syntax Tree (AST)
10:01 - Interpreter & Bytecode
10:58 - JIT Compilation")
