After thoroughly reviewing the MDN disclaimers and warnings, as well as an enlightening discussion in a popular online forum, I still find myself seeking answers. This question arose from a previous exchange, which can be found here.
Imagine if I were to commit a transgression so egregious that it would haunt me indefinitely — a deed so foul that it brings eternal disgrace upon my family lineage...
Enough of the dramatics. Let's get straight to the heart of the matter:
let proto = Object.getPrototypeOf(Function.prototype);
Object.setPrototypeOf(Function.prototype, {
iBetterHaveAGoodReasonForDoingThis: "Bacon!"
});
// To test its efficacy
let f = (function(){});
console.log(f.iBetterHaveAGoodReasonForDoingThis);
// Covering tracks...
Object.setPrototypeOf(Function.prototype, proto);
In essence, what I did there was modify the prototype of Function.prototype, a pivotal object that influences virtually all JavaScript code. And then promptly reverted it.
This experiment aimed to showcase a significant alteration in the prototype chain that could impact numerous codes and potentially compromise optimizations. If reverting the change wouldn't alleviate any issues (in fact, it might worsen performance), I'm curious to know. My intent was never to sabotage efficiency but rather to explore how the JavaScript environment responds.
So, post this modification, does the JavaScript engine embark on a process of recovery and resume optimizing? Or does it resign itself to perpetual deoptimized execution? Are there optimization thresholds that remain unattainable due to such interference? Can one anticipate a return to normalcy after a recuperation period?
It's worth noting that my inquiry pertains to advanced engines like the latest iteration of V8, excluding antiquated platforms akin to older versions of Internet Explorer. While different systems may yield varied outcomes, I hope to uncover shared principles across these environments.