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Is there a way to know how test (for regex) or cos (for math) or substring (for string) or splice (for array) have been coded in the exact syntax either by a way in Javascript (like alert(function)) or by seeking in the files that come with Firefox?
These functions are actually implemented differently by browsers in one of the OS native languages.
So these algorithms are written in c, c++, c#, java etc. but not in JavaScript.