Follow @engineerinazure Prod bugs rarely come from wrong logic. They come from silent mutation. One index assignment, one shared array, and suddenly UI becomes non-deterministic. Array.prototype.with() fixes this by design — new array, clear intent, no side-effects. If your data is cached, shared, or reused across execution paths, mutation isn’t an optimization — it’s a bug. Save this. Your future post-mortem will thank you. #JavaScript #WebDevelopment #FrontendEngineering #SoftwareEngineering #CleanCode