Optimize JavaScript with Optional Chaining

We often scare ourselves thinking writing custom code or polyfills is too complex. So we avoid it. Instead of overthinking the complexity, we can create a simple blueprint and move one step at a time. That’s exactly what I tried today. I picked something that usually feels intimidating . Built Redux from scratch . 🛠️ Not the real one - a tiny version with just three functions: getState, dispatch, and subscribe. That's it. That's Redux at its core. Just understanding: - how state is stored - how actions are dispatched - how listeners react to changes Sometimes, the best way to understand a tool is to rebuild it yourself. 👉 Checkout the repo for full code. https://lnkd.in/g_gHB_5S #javascript #redux #webdevelopment #frontend #learninginpublic #codingjourney

⚡ Most developers accidentally make async JavaScript slower than it needs to be. A lot of people write async code like this: await first request wait… await second request wait… await third request It works. But if those requests are independent, you’re wasting time. The better approach: ✅ run them in parallel with Promise.all() That small change can make your code feel much faster without changing the feature at all. Simple rule: If task B depends on task A → use sequential await If tasks are independent → use Promise.all() This is one of those JavaScript habits that instantly makes you look more senior 👀 Join 3,000+ developers on my Substack: 👉 https://lnkd.in/dTdunXEJ How often do you see this mistake in real codebases? #JavaScript #WebDevelopment #Frontend #SoftwareEngineering #AsyncJavaScript #Promises #CodingTips #Developers #LearnToCode #AITechDaily

I just published a new open-source library: input-mask. I built it because input masking on the frontend often feels more annoying than it should be, especially in simple projects, forms, landing pages, and workflows where you just want to configure the field and move on. The idea is straightforward: apply input masks using HTML attributes only, without needing to write JavaScript just to initialize everything. You add the library via CDN, use attributes like data-mask="pattern" or data-mask="currency" on the input, and it handles the rest. Under the hood it uses IMask, but the whole point was to hide that complexity and make the implementation much more accessible. The first public version already supports: • pattern • regex • number • currency • date Repo: https://lnkd.in/e6pkj7wB CDN: https://lnkd.in/ebc7fdr5 If anyone wants to try it, share feedback, or suggest improvements, I’d love to hear it. #javascript #frontend #webdev #opensource #forms #nocode

Understanding the "this" keyword in JavaScript 🔍 The value of "this" depends on how a function is called — not where it is defined. Here are the key cases: • Global scope → "this" refers to the global object (window in browser) • Object method → "this" refers to the object calling the method • Constructor function → "this" refers to the new instance created • Event handler → "this" refers to the element that triggered the event Mastering "this" helps in writing better object-oriented and reusable code. Still practicing with different examples to understand it deeply 💻 #javascript #webdevelopment #frontend #learninginpublic #mern

I thought learning more frameworks would make me a better developer. It didn’t — understanding the basics did. Day 17 of rebuilding my frontend foundations from Talha Tariq Stepping back to HTML and CSS helped me see what I was missing: • Faster debugging (I understand the “why”) • More predictable layouts • Cleaner, simpler code Frameworks are powerful — but without fundamentals, they hide gaps instead of fixing them. If you’re feeling stuck, try going back to basics. It pays off faster than you think. Are you building on strong fundamentals or just tools? 👇 #frontend #webdevelopment #buildinpublic #html #css

Understanding Event Delegation in JavaScript Handling events efficiently is an important part of writing scalable frontend code. Instead of attaching event listeners to multiple child elements, we can attach a single listener to their parent — this technique is called Event Delegation. 🔹 Benefits: Improves performance. Reduces memory usage. Handles dynamically added elements. 🔹 Example: document.getElementById("parent").addEventListener("click", function(e) { if (e.target && e.target.matches(".child")) { console.log("Child clicked!"); } }); Writing efficient code is not just about functionality, but also about optimization. Have you used this approach in your projects? #javascript #webdevelopment #frontend #coding

⚠️ JavaScript Mistakes Every Developer Should Know Even experienced developers make these mistakes… avoid them 👇 ❌ Using == instead of === 👉 Can cause unexpected results due to type conversion ❌ Forgetting return in functions 👉 Function runs but returns undefined ❌ Not handling asynchronous code 👉 Code executes before data is ready ❌ Mutating objects/arrays directly 👉 Can lead to unexpected bugs ❌ Ignoring this behavior 👉 this depends on how a function is called ❌ Using var instead of let/const 👉 Leads to scope-related issues 🔥 Key Takeaway: Small mistakes in JavaScript can lead to big bugs. Write clean and predictable code. 💬 Which mistake have you made before? #javascript #webdevelopment #frontend #coding #100DaysOfCode

A few years back… I thought all functions are hoisted the same way 😅 But actually… only one type gets VIP access 😅 👉 Function declaration → fully hoisted ✅ 👉 Function expression → hoisted as undefined ❌ 👉 Arrow function → same as above ❌ So this works 👇 sayHello() But these crash 👇 sayHi() sayBye() Because JavaScript treats them like variables first… and functions later 🤯 🔥 Rule: Only function declarations are safe to call before definition What’s the most confusing hoisting example you’ve seen? 😅 👉 var vs let? 👉 functions vs arrow functions? 👉 something weird in real project? Drop it in comments — let’s confuse everyone together 😂 #javascript #webdev #frontend #codingtips #developer

Closures used to confuse me a lot… until today 💡 Now I realize it's just about a function remembering its data. Simple idea, powerful use. If you're learning JavaScript, don’t skip this 🚀 💬 Do closures make sense to you now? #JavaScript #WebDevelopment #Frontend #CodingJourney #Developers

⚡ Part 6 of 10: React performance conversations often start too early. Someone sees a rerender and immediately reaches for memoization. But sometimes the real issue is simpler than that. Bad state shape. Too much work inside render. Unclear data flow. A component tree that grew without much intention. I’m not against optimization. I just think the better starting point is: What actually feels slow? Where’s the bottleneck? What problem are we solving? A lot of React code gets more complicated in the name of performance without actually getting better. Have you ever seen “performance optimization” make a codebase worse? #React #ReactPerformance #FrontendPerformance #JavaScript #TypeScript #SoftwareEngineering #WebPerformance