JavaScript Engine and code execution
In this chapter, you will learn how the JavaScript code which we write, is executed. A JavaScript code is always hosted in some environment and in case of client-side JavaScript, the environment is most typically, a browser such as google chrome, safari etc.
So, a client-side JavaScript program runs inside a browser. When we write a JavaScript code and run it inside the browser, there is a lot of things happen behind the scene.
Every browser has something called as a JavaScript engine that is responsible for executing JavaScript code. There are many JavaScript engines like V8 of Google chrome, SpiderMonkey for Firefox etc.
Let's understand how a JavaScript engine executes a JavaScript code.
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