Am I right in thinking that we can’t actually see the body of built-in constructor functions - i.e. String - because it's written in different language(s)?
In the console it comes up as 'native code'.
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tonitone117
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It's unclear what you mean by "see". `"String" in window` is perfectly visible even if it was defined by the engine, no? – Bergi Jul 26 '20 at 20:43
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Do you mean the source code of these built in functions? – Unmitigated Jul 26 '20 at 20:44
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Seems this question is just about which language JavaScript implementations are written in, not specifically constructors? Dupe of [Which language is JavaScript written in](https://stackoverflow.com/questions/7005729/what-language-is-javascript-written-in)? – trincot Jul 26 '20 at 20:45
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Another reason for not showing the code (if it's JS) is to prevent browser fingerprinting. – Jonas Wilms Jul 26 '20 at 21:19
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Functions which appear as [native code] appear that way because they are exactly that: native code. Their content is written in the language the javascript runtime is written in (e.g. node is written in C++ and deno is written in Rust).
Aplet123
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They could also be written in Torque or some other language. Narrowing it down to C++ and Rust is not true. – Jonas Wilms Jul 26 '20 at 21:18