🚫 Stop Writing Old JavaScript — ✅ Start Using Modern Built-in APIs (Part 1)

You're probably writing more code than needed. Modern JavaScript already solved most of these problems. 🚀 The Problem (Real Talk) In many production codebases, I still see: lodash for simple utilities JSON hacks for deep cloning manual formatting logic mutation-heavy patterns 👉 This leads to: bigger bundle sizes harder debugging subtle bugs (especially in React apps) 👉 Modern JavaScript already has built-in solutions for most of these problems. 🎯 What You'll Learn In this post: Replace outdated patterns Write cleaner, safer code Use modern APIs already available in JavaScript 🧩 Modern APIs You Should Already Be Using 1. Deep Copy Objects (Without Breaking Data) ❌ Old way const copy = JSON . parse ( JSON . stringify ( obj )); ⚠️ Why this is dangerous Breaks Date , Map , Set Removes undefined Causes hidden bugs const obj = { date : new Date (), role : undefined , scores : new Map ([[ " math " , 95 ]]) }; const copy = JSON . parse ( JSON . stringify ( obj )); console . log ( copy . date i