Does some JavaScript library use dynamic aspects of the prototype system?

Question

JavaScript object created with a prototype maintains \"live\" connection to its prototype, so that changing the prototype also affects the objects created from it.

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Answer 1

This dynamism is present in polyfill libraries that patch older browsers, e.g. by adding Array.prototype.map, or add upcoming new features from ES6, e.g. Array.prototype.find. See https://github.com/paulmillr/es6-shim/ for an example.