Where can I find javascript native functions source code? [duplicate]

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Both Chrome and Firefox are open source and you can look at the implementation of any part of the javascript engine in the source code for those products. Other browsers have their own implementation (like IE) that is not available to the public to look at.

The Chrome v8 javascript engine code is here: https://github.com/v8/v8

The Firefox SpiderMonkey engine code is here:
https://searchfox.org/mozilla-central/source/js/src

Warning, if you aren’t already familiar with those products and their tools, it may take while to get familiar enough to find what you’re looking for.

These links may change over time, but can easily be found with Google searches if they move.

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