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How do engines work?

Engines are complicated. But the basics are easy.

  1. The engine (embedded if it’s a browser) reads (“parses”) the script.
  2. Then it converts (“compiles”) the script to machine code.
  3. And then the machine code runs, pretty fast.

The engine applies optimizations at each step of the process. It even watches the compiled script as it runs, analyzes the data that flows through it, and further optimizes the machine code based on that knowledge.

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to remember because they are used in developer articles on the internet. We’ll use them too. For instance, if “a feature X is supported by V8”, then it probably works in Chrome, Opera and Edge. <span>How do engines work? Engines are complicated. But the basics are easy. The engine (embedded if it’s a browser) reads (“parses”) the script. Then it converts (“compiles”) the script to machine code. And then the machine code runs, pretty fast. The engine applies optimizations at each step of the process. It even watches the compiled script as it runs, analyzes the data that flows through it, and further optimizes the machine code based on that knowledge. What can in-browser JavaScript do? Modern JavaScript is a “safe” programming language. It does not provide low-level access to memory or the CPU, because it was initially created for br


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