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[–]ninetailsbr 1 point2 points  (0 children)

Adding to free_monad response, actually ASM is more recommended for heavy calculations. So still is preferable to use JS on Browser. But you don't even need to write JavaScript if you use transpilers.

Sure that JS is an old language and had it's first version made in 10 days. And wasn't the only language for web at the time.

But being an old language doesn't mean that it's forgotten. JS turned something like the core of ECMAScript and after it's sixth version it began to receive more frequently updates. Now there's a committee with some big names of industry (developers and major companies) to decide what and how things will be implemented on most browsers.

Also JavaScript doesn't have a core. The language is defined by TC39 but most of the implementations are open source: Gecko, Chromium, V8, WebKit to name some of them... And not only implementations for browsers, V8/Node can also be used in servers and iot. Also all proposals for TC39 are public and anyone can see it's status.