javascript - Array.prototype.concat() under the hood -

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How can I see what code inside the function concat? How does it do that? Does anyone have a copy of the passport or is there a way to view it in the browser console?

Console fear does not give me access to previous 

  console.dir (Array .prototype.concat); Function concat () {[native code}} logic: zero collar: faucet length: 1 name: "concat" __proto__: function below () {} & lt; Function scope & gt;   
 I do not know how to monitor it but there should be a way to dig in javascript functions   
 
 
  array  comes with javascript, so it depends on your javascript engine how it applies. JS engine is free to implement it in any way. The possibility is that it does not use Javascript because it can be slow or not possible because you will need a JavaScript engine with that feature that you are trying to implement to implement it ().  
 In most browsers, code javascript functions are implemented in C / C ++ Here is an example of the browser's Chrome / Chromium family source:  In the InstallFunctions  ArrayConcatJS  Go to  Array.prototype.concat   1519 Line and go on to achieve success.  
  Array.concat  can be found for:  js_concat ()  (like 1322) in the method.

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