Is there any open source interpreter for JavaScript?

Question

Is JavaScript an open source programming language? I want to know how some objects and methods work.

I mean, is the compiler, interpreter, or parser for JavaScript open source?

Answer 1

There are numerous open source JavaScript engines (V8, Rhino and SpiderMonkey spring to mind) as well as closed source implementations (I assume that whatever Opera and Microsoft use are not open source).

The language is fairly tightly based on the ECMAScript specification, which is freely available.

Answer 2

What do you mean by open source language?

JavaScript is interpreted by the browser and depends upon the vendor and developer which engine it uses. Some of the popular engines are listed in List of ECMAScript engines.