Stop Learning JavaScript's 'Bad Parts'

If you're still writing plain JavaScript in 2026, you're now in the 6%. The State of JavaScript 2025 just made it official: → 40% of developers write exclusively in TypeScript → Only 6% write exclusively in plain JavaScript We didn't just cross a tipping point. We passed it and most people didn't notice. The survey conclusion was unambiguous: "TypeScript has won. Not as a bundler but as a language." And the ecosystem followed through: → Node.js now supports type stripping natively in stable versions → Deno and Bun have supported TypeScript out of the box for years → GitHub Octoverse 2025 ranked TypeScript #1 by contributor count above Python I've been writing TypeScript in production for years across full-stack systems React frontends, NestJS APIs, data-intensive platforms. And the pattern is always the same: The bugs that are hardest to debug in production are almost never logic bugs. They're shape bugs unexpected undefined, mismatched response structures, data that was valid at one layer and broken at another. TypeScript doesn't eliminate those bugs entirely. But it moves them from runtime to compile time and that's the difference between a 2am incident and a red underline in your IDE. Recruiters know this. Engineering teams know this. Job postings that listed TypeScript as "a plus" two years ago now list it as a requirement. If TypeScript isn't part of your stack in 2026, you're not making a technical choice. You're making yourself harder to hire. Where are you in your TypeScript journey? Still migrating, fully in, or holding out? 👇 #TypeScript #JavaScript #SoftwareEngineering #FullStackDevelopment #WebDevelopment #Developer #StateOfJS #NodeJS #ReactJS

You add TypeScript to the project. Half the types are any. You basically wrote JavaScript with some extra syntax. TypeScript doesn't make your code safer. You do. And using any turns off the whole tool. Here's what most people miss: any doesn't stay where you put it. It spreads. function getUser(id: string): any { return api.fetch("/users/" + id); } const user = getUser("123"); const name = user.name; const upper = name.toUpperCase(); Every variable in this chain is any. No autocomplete, no safe changes, no errors caught before release. One any at the start shuts down the whole process. This is type erosion. It acts like tech debt — hidden until it causes problems. Before you type any, ask yourself two questions. First question: Do I really not know the type? If the data comes from an API — describe its structure. A partial type is much better than any. Second question: Am I just avoiding a type error? The compiler warns you, and you ignore it. That's not a fix. It's just @ts-ignore with extra steps. Use unknown instead. It means "I don't know" but makes you check before using it. any trusts without question. unknown requires proof. If your code has more than 5% any, you're not really using TypeScript. You're just adding decorations to JavaScript. Run npx type-coverage. Look at the number. Then decide. any is not a type. It's a surrender. #TypeScript #Frontend #JavaScript #WebDev #SoftwareEngineering #CodeQuality

𝟵𝟵% 𝗼𝗳 𝗝𝗦 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 𝘄𝗿𝗶𝘁𝗲 𝗮𝘀𝘆𝗻𝗰 𝗰𝗼𝗱𝗲 𝗱𝗮𝗶𝗹𝘆. 𝗕𝘂𝘁 𝗺𝗼𝘀𝘁 𝗰𝗮𝗻'𝘁 𝗲𝘅𝗽𝗹𝗮𝗶𝗻 𝘄𝗵𝘆 𝗶𝘁 𝗮𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝘄𝗼𝗿𝗸𝘀. 👇 I didn't either until I learned about the JavaScript Runtime Environment. Here's the mental model that changed everything for me: JavaScript by itself is just a language. Runtime = Engine + APIs + Event Loop 🔥 What's actually running under the hood: ⚙️ JS Engine (V8) → converts code to machine code 📞 Call Stack → runs functions one by one 🌐 Web APIs → setTimeout, DOM, fetch (NOT part of JS itself!) 📬 Callback Queue → stores async callbacks ⚡ Microtask Queue → Promises, higher priority 🔄 Event Loop → the brain connecting everything The flow: Code → Call Stack → Web APIs → Queue → Event Loop → Call Stack Right now, try this 👇 console.log("Start"); setTimeout(() => console.log("Async"), 0); console.log("End"); Output → Start, End, Async 🤯 Even with 0 ms delay, "Async" prints LAST. That's the Event Loop doing its job. 🧠 Interview tip: Q: Why can JS handle async if it's single-threaded? A: The Runtime provides Web APIs + Event Loop + Queues — not the language. If this helped, repost ♻️ to help another developer. Follow Amit Prasad for daily updates on JavaScript and DSA 🔔 💬 Comment: Did you know that setTimeout 0ms still runs last? #JavaScript #WebDevelopment #Frontend #NodeJS #100DaysOfCode #DSA #Developer #CodingLife #TechLearning

JavaScript is easy. Until it isn't. 😅 Every developer has been there. You're confident. Your code looks clean. You hit run. And then: " Cannot read properties of undefined (reading 'map') " The classic JavaScript wall. Here are 7 JavaScript mistakes I see developers make constantly and how to fix them: 1. Not understanding async/await ⚡ → Wrong: | const data = fetch('https://lnkd.in/dMDBzbsK'); console.log(data); // Promise {pending} | → Right: | const data = await fetch('https://lnkd.in/dMDBzbsK'); | 2. Using var instead of let/const → var is function scoped and causes weird bugs → Always use const by default. let when you need to reassign. Never var. 3. == instead of === → 0 == "0" is true in JavaScript 😱 → Always use === for comparisons. Always. 4. Mutating state directly in React → Wrong: user.name = "Shoaib" → Right: setUser({...user, name: "Shoaib"}) 5. Forgetting to handle errors in async functions → Always wrap await calls in try/catch → Silent failures are the hardest bugs to track down 6. Not cleaning up useEffect in React → Memory leaks are real → Always return a cleanup function when subscribing to events 7. Treating arrays and objects as primitives → [] === [] is false in JavaScript → Reference types don't compare like numbers — learn this early JavaScript rewards the developers who understand its quirks. 💡 Which of these caught YOU off guard when you first learned it? 👇 #JavaScript #WebDevelopment #Frontend #FullStackDeveloper #React #Programming #CodingTips #Developer #Tech #Pakistan #LearnToCode #JS #SoftwareEngineering #100DaysOfCode #PakistaniDeveloper

I was recently asked a classic JavaScript "gotcha" in an interview: "How do you return an object in an arrow function, and why are parentheses required?" It sounds simple But the "Why" is where most developers get tripped up. The Problem: In JavaScript, {} is ambiguous. It can mean an Object Literal OR a Function Block. By default, the JS engine sees a brace after an arrow => and assumes it's a function block. The Result: const getUser = () => { name: 'Chandhan' }; The engine thinks name: is a label and returns undefined. The Fix: Wrap it in parentheses! ({ ... }) The () forces the engine to treat the contents as an expression, not a statement. ✅ const getUser = () => ({ name: 'Chandhan' }); Small syntax, big difference in how the engine parses your code. #JavaScript #WebDevelopment #CodingTips #Angular #Frontend #InterviewPrep

𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗘𝘃𝗲𝗻𝘁𝗟𝗼𝗼𝗽 𝗘𝘅𝗽𝗹𝗮𝗶𝗻𝗲𝗱 (𝗔 𝗠𝘂𝘀𝘁‐𝗞𝗻𝗼𝘄 𝗖𝗼𝗻𝗰𝗲𝗽𝘁) Understanding the JavaScript Event Loop is a game changer for writing efficient and predictable asynchronous code. Many developers use setTimeout and Promises every day — but far fewer truly understand how JavaScript executes async tasks behind the scenes. Let’s break it down 👇 𝗛𝗼𝘄 𝘁𝗵𝗲 𝗘𝘃𝗲𝗻𝘁 𝗟𝗼𝗼𝗽 𝗪𝗼𝗿𝗸𝘀  • JavaScript runs on a single thread  • Synchronous code executes first via the Call Stack  • Then Microtasks run (like Promises)  • Next, one Macrotask executes (timers, events)  • This cycle continues repeatedly  𝗘𝘅𝗲𝗰𝘂𝘁𝗶𝗼𝗻 𝗣𝗿𝗶𝗼𝗿𝗶𝘁𝘆 ➡️ Synchronous ➡️ Microtasks ➡️ Macrotasks 𝗪𝗵𝘆 𝘁𝗵𝗶𝘀 𝗰𝗼𝗻𝗰𝗲𝗽𝘁 𝗺𝗮𝘁𝘁𝗲𝗿𝘀 ✅ Debug async issues with confidence ✅ Avoid unexpected execution order ✅ Build more predictable React applications ✅ Frequently tested in frontend interviews Credit: owner Follow Alpna P. for more related content! 🤔 Having Doubts in technical journey? 🚀 Book 1:1 session with me : https://lnkd.in/gQfXYuQm 🚀 Subscribe and stay up to date: https://lnkd.in/dGE5gxTy 🚀 Get Complete React JS Interview Q&A Here: https://lnkd.in/d5Y2ku23 🚀 Get Complete JavaScript Interview Q&A Here: https://lnkd.in/d8umA-53 #JavaScript #EventLoop #FrontendDevelopment #ReactJS #WebDevelopment #InterviewPrep #AsyncJavaScript #SoftwareEngineering

Really insightful explanation of the JavaScript event loop. Breaking down complex concepts like this in a simple and practical way is not easy — great work! Alpna P. Posts like these truly help developers strengthen their fundamentals. Looking forward to more such content.

TypeScript enums are problematic. Here's what senior developers use instead. Enums look useful. They feel organised. But they introduce real problems in TypeScript projects. The problems with enums: ts// Numeric enums have dangerous reverse mappings enum Direction { Up, Down, Left, Right } Direction[0] // 'Up' — this exists at runtime and causes confusion // Enums are not just a type — they generate JavaScript code // That means your bundle is larger than it needs to be // Const enums cause issues with babel and SWC compilers const enum Status { Active, Inactive } // Can break in certain build configurations What to use instead: Option 1 — Union types (best for most cases) tstype Direction = 'up' | 'down' | 'left' | 'right' // Autocomplete works perfectly // No JavaScript generated // Fully type-safe Option 2 — As const objects (best when you need runtime access) tsconst Status = { ACTIVE: 'active', INACTIVE: 'inactive', PENDING: 'pending', } as const type Status = typeof Status[keyof typeof Status] // Type: 'active' | 'inactive' | 'pending' // You can still do: Status.ACTIVE // 'active' — runtime access works Object.values(Status) // ['active', 'inactive', 'pending'] Why as const objects win: → No extra JavaScript generated → Runtime access when you need it → Works with every build tool → Type is derived automatically → Readable, familiar object syntax Union types for simple cases. as const objects when you need runtime access. Enums — almost never. Were you using enums? What are you switching to? 👇 #TypeScript #JavaScript #FrontendDevelopment #ReactJS #WebDevelopment #CleanCode #SoftwareEngineering

I used Claude the wrong way for a while. I kept one long thread open and kept asking for small changes. “Fix this TypeScript error.” “Now make it cleaner.” “Now convert it to React hooks.” “Now add loading state.” “Now make it production-ready.” The problem is simple. Every new message adds more context, and Claude has to process all of that again. So the thread grows, token usage grows, and the output often gets worse because the context becomes noisy. I wrote a blog about how to avoid that. https://lnkd.in/gXu8PK8x A few things that made the biggest difference for me: * start a fresh chat more often * give the full instruction in one go * summarise old context instead of dragging the whole thread * control output size when you only need code or a short answer Small prompt changes make a big difference when you use Claude every day for development work. #Claude #AI #JavaScript #TypeScript #React #NodeJS #PromptEngineering #SoftwareEngineering #WebDevelopment #Developers

TypeScript 6.0 is here, and it's more than just another version bump. This release fundamentally changes how we think about type safety and performance in JavaScript development for 2026. Here are the key advanced features that will impact your codebase: 🧠 **Context-Aware Type Inference** Method syntax now works identically to arrow functions. TypeScript 6.0 checks if `this` is actually used before marking a function as "contextually sensitive," eliminating a major pain point in generic function calls. 🗺️ **#/ Subpath Imports** No more relative path hell. TypeScript now supports `#/` prefix for subpath imports, matching bundler conventions and cleaning up import statements across your codebase. ⚖️ **Stable Type Ordering** The new `--stableTypeOrdering` flag ensures deterministic type unions, eliminating noise when comparing compiler outputs. This prepares us for TypeScript 7.0's parallel type checking. ⏰ **Temporal API Types** Built-in types for the Temporal API are now included. Say goodbye to Date object headaches with proper timezone awareness, immutability, and a clean API. 🗺️ **Map Upsert Methods** `getOrInsert()` and `getOrInsertComputed()` eliminate the verbose "check-if-exists-then-set" pattern for Maps, reducing boilerplate and potential errors. 🛡️ **RegExp.escape()** Safer regex construction from user input with built-in escaping, preventing regex injection vulnerabilities. 🚨 Breaking Changes Alert TypeScript 6.0 introduces significant defaults changes: - `strict: true` by default - `module: esnext` by default - `types: []` by default (explicit is better!) - `target: es5` is deprecated These changes prepare us for TypeScript 7.0's native port and performance improvements. The migration requires attention but sets the stage for faster builds and more reliable type checking. TypeScript continues to evolve from a type checker into a comprehensive development platform. Full deep dive with code examples: https://lnkd.in/eBGiPbkE What TypeScript 6.0 feature are you most excited about? Share your thoughts below! #TypeScript #JavaScript #WebDevelopment #Programming #TypeScript6 #SoftwareEngineering #DeveloperTools #2026Tech