JavaScript Refresher and Detailed Study - Part 7
Last updated on 3 Oct 2026 Post series: Part 1 , Prev Part (6) , Post Series TOC Contents Prior exchanges with Gemini on JS prototype inheritance Object.keys() , Object.values() , and Object.entries() are preferred over for...in in modern JS app codebases Because Object.keys() and Object.entries() natively filter out the prototype chain, the classic hasOwnProperty() guard is obsolete for iteration Manually wiring up prototype chains using __proto__ or Object.setPrototypeOf() is considered an anti-pattern in modern application development ES6 Classes are used instead of F.prototype pattern in modern JS apps Object.prototype contains zero data properties and only a small handful of methods Viewing prototype chains in Chrome debugger Method borrowing (of methods like Array.prototype.join) is not used in modern JS app codebases Though setting prototype at creation via Object.create() is fast, modern teams rely on ...