Mykhailo Kalika’s Post

🚀 50 Weeks, 50 Projects – Week 6 Complete To push my development skills beyond tutorials, I'm continuing my 50 Weeks, 50 Projects challenge, where I build and ship one project every week. 🛠 Week 6 – API Lens: AI-Powered JSON Explorer Ever stared at a raw API response and had no idea what half the fields meant? That's exactly why I built this. Tech Stack: HTML · CSS · Vanilla JS · OpenRouter API (Mistral-7B, free tier) Design Style: Warm, human-first UI — cream tones, serif typography (Fraunces), and a layout that feels more like a notebook than a dev tool. Built specifically to be approachable for beginners. Functionality: 📋 Paste raw JSON or fetch any public API URL directly 🤖 AI explains every field in plain English — no docs needed 🌳 Interactive collapsible field tree with color-coded types ⏱ Unix timestamps decoded to human-readable dates automatically 🛡 Auto-detects response type: JWT, paginated list, error, REST 📋 One-click copy for JS, Python & cURL code snippets ⚡ 3-layer CORS proxy fallback — works with almost any public API Suggestions: I'd love feedback from the community! What other API patterns should I detect? Any features that would make this more useful in your daily workflow? Live URL : https://lnkd.in/dBcejh34 #50WeeksChallenge #BuildInPublic #WebDev #JavaScript #API #OpenSource #100DaysOfCode

I used to think flatMap was just a nicer map().flat(). But it's not just it. map assumes a 1 → 1 transformation. Each input produces exactly one output. But real data rarely works like that. Sometimes an item produces multiple results. Sometimes none at all. That’s where flatMap changes the mental model. It’s not about flattening, instead it's about expressing 1 → 0..n transformations explicitly. And that clarity becomes really valuable as soon as your data transformations stop being trivial. Small API, but a meaningful shift in how you think about data. #javascript #frontend #softwareengineering #webdevelopment #cleanCode #coding --- I post about web engineering, front-end and soft skills in development. Follow me here: Irene Tomaini

𝗘𝘃𝗲𝗿 𝘁𝗿𝗶𝗲𝗱 𝗱𝗲𝗯𝘂𝗴𝗴𝗶𝗻𝗴 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗰𝗼𝗱𝗲... 𝗼𝗻𝗹𝘆 𝘁𝗼 𝗳𝗮𝗰𝗲 𝘂𝗻𝗿𝗲𝗮𝗱𝗮𝗯𝗹𝗲 𝘀𝘁𝗮𝗰𝗸 𝘁𝗿𝗮𝗰𝗲𝘀? You're not alone. Behind the scenes, 𝒔𝒐𝒖𝒓𝒄𝒆 𝒎𝒂𝒑𝒔 are what make modern JavaScript debugging possible—translating minified, bundled code back into something humans can actually understand. But here's the problem: Until recently, source maps haven't been... standardized. That means inconsistencies across tools, edge cases in debugging, and unnecessary friction for developers trying to trace issues in production. In this deep dive from Bloomberg, one thing becomes clear: 👉 Standardizing source maps isn't just a technical upgrade—it's a 𝒅𝒆𝒗𝒆𝒍𝒐𝒑𝒆𝒓 𝒆𝒙𝒑𝒆𝒓𝒊𝒆𝒏𝒄𝒆 𝒃𝒓𝒆𝒂𝒌𝒕𝒉𝒓𝒐𝒖𝒈𝒉. Why it matters: 🔹 More reliable debugging across environments 🔹 Better interoperability between tools and frameworks 🔹 Fewer “it works on my machine” moments And the bigger picture? As our tooling gets more complex, 𝒔𝒕𝒂𝒏𝒅𝒂𝒓𝒅𝒔 𝒃𝒆𝒄𝒐𝒎𝒆 𝒕𝒉𝒆 𝒊𝒏𝒗𝒊𝒔𝒊𝒃𝒍𝒆 𝒇𝒐𝒖𝒏𝒅𝒂𝒕𝒊𝒐𝒏 that keeps everything working together. We often celebrate new frameworks and features, but it's efforts like these, happening quietly in the background, that truly move the ecosystem forward. If you care about performance, observability, or developer productivity… this is worth your attention. 📖 Source: Bloomberg Engineering - "Standardizing Source Maps" https://lnkd.in/d-jD8axy #JavaScript #DeveloperExperience #WebDevelopment

Have you ever found yourself lost in callbacks, wondering when your code will execute? Promises are here to save the day! They provide a cleaner way to handle asynchronous operations and make your code more manageable. ────────────────────────────── Promises: then catch finally Let's dive into how promises work in JavaScript and why they matter. #javascript #promises #asynchronous #coding #webdevelopment ────────────────────────────── Key Rules • Use .then() to handle successful outcomes. • Use .catch() to handle errors gracefully. • Use .finally() for cleanup tasks, regardless of success or failure. 💡 Try This fetch('https://lnkd.in/gyV9Vyeh') .then(response => response.json()) .then(data => console.log(data)) .catch(error => console.error('Error:', error)) .finally(() => console.log('Fetch attempt finished.')); ❓ Quick Quiz Q: What method do you use to handle errors in a promise? A: .catch() 🔑 Key Takeaway Embrace promises to write cleaner, more readable asynchronous JavaScript code! ────────────────────────────── Small JavaScript bugs keep escaping to production and breaking critical user flows. Debugging inconsistent runtime behavior steals time from feature delivery.

💡 Understanding Two Sum — It’s Not About the Numbers, It’s About Timing Today I revisited the classic Two Sum problem and realized something simple but powerful: 👉 The algorithm doesn’t try to find the best pair 👉 It doesn’t look for largest numbers 👉 It doesn’t check all possibilities It simply returns the first valid pair it encounters during traversal Key Insight: The result depends entirely on the order of iteration Example: nums = [1, 2, 4, 5, 6, 8] target = 10 We might expect: 2 + 8 = 10 → indices [1, 5] But the algorithm returns: 4 + 6 = 10 → indices [2, 4] Why? Because: 4 is seen earlier 6 appears soon after The algorithm stops immediately when it finds the first match The Rule to Remember: 🧠 Hash map solution returns the first valid pair based on traversal order Takeaway: This isn’t just about solving Two Sum — it’s about understanding how algorithm behavior is shaped by execution flow, not just logic. Once you see this, you stop memorizing solutions and start actually understanding them. #JavaScript #Algorithms #CodingInterview #SoftwareEngineering #ProblemSolving

Life evolves and so do the universe, evolution doesn’t stops in the trajectory of frontend where we as developers generalise new enhancements. A precisely intriguing feature of JavaScript arrived recently Temporal API which is explained below: 🚀 ✨JavaScript’s Temporal API finally deposes the flawed Date object, introducing a robust, immutable engine for time-series data. It eliminates "off-by-one" month errors and complex millisecond math with dedicated types like PlainDate and ZonedDateTime. Developers can now handle Daylight Saving Time transitions and IANA time zones natively without bulky external libraries. Its built-in comparison methods and duration arithmetic bring long-awaited precision to complex scheduling logic. This shift signifies a leap toward human-readable code that respects the nuances of global calendars. Say goodbye to Moment.js—the future of JavaScript time is type-safe, scalable, and standardized. The Magic in Action: The Magic in Action: ✨ // Adding 1 month to Jan 31st no longer "overflows" into March! 🏗️ const jan31 = Temporal.PlainDate.from('2026-01-31'); 🧪 const nextMonth = jan31.add({ months: 1 }); 📟 console.log(nextMonth.toString()); 💡 // Result: "2026-02-28" (Smart & Precise) #JavaScript #WebDev #Coding #TemporalAPI #SoftwareEngineering

🛠️ Must-Have VS Code (and Cursor) Extensions Since Cursor is fork-based, almost all your favorite VS Code extensions work perfectly there too. Here are my top picks for 2026: 1. The Productivity Powerhouses: Error Lens: No more hovering over red squiggles. It prints the error message right next to your code so you can fix it instantly. GitLens: Essential for team collaboration. See exactly who changed what and why, directly in the editor. Turbo Console Log: For my fellow JavaScript devs—this automates the tedious task of writing meaningful logs. 2. Frontend & Styling: Tailwind CSS IntelliSense: A must-have for rapid UI development. Autocomplete for classes saves me hours of looking at documentation. ES7+ React/Redux/React-Native snippets: I can’t remember the last time I manually typed out a functional component boilerplate. 3. Backend & API Testing: Thunder Client: Stop switching to Postman. This lightweight REST client lives right inside your sidebar. MongoDB for VS Code: Manage your clusters and explore your collections without leaving your dev environment. The Bottom Line: Tools don't replace the developer, but they sure do make the journey a lot smoother. What’s the one extension you literally cannot live without this year? Let’s swap secrets in the comments! 👇 #WebDev #FullStack #MERN #CursorAI #VSCode #ProgrammingTips #DeveloperExperience #Coding2026

📣 𝗡𝗲𝘅𝘁 𝗕𝗹𝗼𝗴 𝗶𝘀 𝗛𝗲𝗿𝗲! ⤵️ Array Methods You Must Know — Writing Less Loops, More Logic ⚡🧠 Working with arrays using only loops feels repetitive. Modern JavaScript gives cleaner tools — and this blog explains them step by step. 🔗 𝗥𝗲𝗮𝗱 𝗵𝗲𝗿𝗲: https://lnkd.in/gqQKdsAc 𝗧𝗼𝗽𝗶𝗰𝘀 𝗰𝗼𝘃𝗲𝗿𝗲𝗱 ✍🏻: ⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺ ⇢ Adding and removing elements using push, pop, shift, unshift ⇢ Looping arrays cleanly with forEach() ⇢ Transforming data using map() ⇢ Filtering values using filter() ⇢ Combining array values using reduce() ⇢ Traditional loops vs modern method chaining ⇢ Real beginner examples and practice assignments ⇢ Common mistakes like forgetting return in map/filter ⇢ Mental model to choose the right method 💬 If arrays still feel like “write loop → do work → repeat”, this article helps you understand how modern array methods make code cleaner, shorter, and easier to reason about. #ChaiAurCode #JavaScript #ArrayMethods #WebDevelopment #ProgrammingBasics #Beginners #LearningInPublic #100DaysOfCoding

Just shipped something I'm genuinely proud of, I call it AlgoTracker I've always struggled to truly understand Big O Notation just by reading about it. So I built a visual tool to help me see it in action. What it does: Linear Search O(N) and Binary Search O(log N) Selection Sort and Insertion Sort O(N²) A time complexity graph that runs each algorithm, measures how long it takes, and compares them visually based on input size A step-by-step visualizer so you can watch exactly how data gets sorted or searched The time complexity graph is my favourite feature, you can literally see which algorithm is faster as you increase the data size. Built it using Recharts for the graph visuals. This project started as a learning tool for myself, but I think it could help any developer who learns better by seeing rather than just reading. Live demo: https://lnkd.in/djuGe-tJ GitHub: https://lnkd.in/dmrribMi Built with React · Tailwind CSS v4 · Recharts · Node.js #webdeveloper #javascript #react #buildinpublic #opensource

Well, this is interesting. Why on earth the extreme hype and churn over the 'leak' when in reality the source code was _always_ there?? I need to remember to always take a step back before getting sucked into the drama! Even so, I've got no idea what is driving all this fever. And most likely it's just one of those things, no mysterious deeper meaning. 🤷