JavaScript Event Loop Gotchas: Understanding Microtasks and Macrotasks

💻 𝗦𝘁𝗶𝗹𝗹 𝘂𝘀𝗶𝗻𝗴 𝗼𝗻𝗹𝘆 𝗰𝗼𝗻𝘀𝗼𝗹𝗲.𝗹𝗼𝗴()? 𝗬𝗼𝘂'𝗿𝗲 𝗱𝗲𝗯𝘂𝗴𝗴𝗶𝗻𝗴 𝘁𝗵𝗲 𝗵𝗮𝗿𝗱 𝘄𝗮𝘆. Ever struggled with messy logs or figuring out where your function was called from? JavaScript gives you much better tools 👇 🔹 𝗕𝗮𝘀𝗶𝗰 𝗗𝗲𝗯𝘂𝗴𝗴𝗶𝗻𝗴 console.log(user); console.error("Error occurred"); console.warn("Deprecated API"); 🔹 𝗕𝗲𝘁𝘁𝗲𝗿 𝗩𝗶𝘀𝘂𝗮𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻 console.table(users); 🔹 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗧𝗿𝗮𝗰𝗸𝗶𝗻𝗴 console.time("API"); // call API console.timeEnd("API"); 🔹 𝗦𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲𝗱 𝗟𝗼𝗴𝘀 console.group("User"); console.log(user.name); console.groupEnd(); 🔹 𝗧𝗿𝗮𝗰𝗲 𝗘𝘅𝗲𝗰𝘂𝘁𝗶𝗼𝗻 console.trace(); 🔥 𝗣𝗿𝗼 𝗧𝗶𝗽: Use console.table() for API responses — it makes debugging 10x cleaner. 🚀 Debug smarter, not harder. 💬 Which console method do you use the most? #JavaScript #WebDevelopment #Debugging #Frontend #CodingTips

Day 14 #100DaysOfCode 💻 Today I learned Promise & Async/Await in JavaScript. Promise helps handle asynchronous operations like API calls. Async/Await makes code cleaner and easier to read. Example: function getData() { return new Promise((resolve) => { setTimeout(() => { resolve("Data received"); }, 1000); }); } async function fetchData() { const result = await getData(); console.log(result); } fetchData(); Now I can handle async code without messy callbacks 🚀 #JavaScript #AsyncAwait #Promise #WebDevelopment #CodingJourney #Akbiplob

hi connections Day 16 of 30: Implementing a Promise Time Limit! Moving deeper into the Asynchronous section of my 30 Days of JavaScript on LeetCode. Today was about adding a "safety net" to our code. 🛠️⏳ The Goal: Wrap an async function so that if it takes longer than a specified time t, it immediately fails with a "Time Limit Exceeded" error. The Lesson: I used Promise.race() to pit the actual function against a custom timeout promise. This pattern is crucial for building resilient systems. Whether it's a web crawler or a high-traffic API, you never want one slow request to block your entire event loop. Control the time, control the performance! 💻🔥 #JavaScript #WebDevelopment #CodingChallenge #LeetCode #Day16 #SoftwareEngineering #AsyncJS #PerformanceOptimization

🐞 Debugging in JavaScript — A Practical Approach 1. Identify the Issue Error message or unexpected output 2. Reproduce the Bug Make sure it happens consistently 3. Inspect the Code • Use console.log() smartly • Use DevTools (breakpoints > guessing) 4. Find the Root Cause Common reasons: • Undefined / null values • Async issues (Promises, APIs) • Scope & hoisting problems 5. Fix & Keep It Simple Don’t over-engineer the solution 6. Test Properly Check edge cases + different inputs #JavaScript #Debugging #Development #Coding

💻 JavaScript Intermediate – Remove Duplicates from an Array Duplicates in arrays can cause bugs or unnecessary processing. Here's a clean way to remove them. 📌 Problem: Get an array containing only unique values. JavaScript code function removeDuplicates(arr) { return [...new Set(arr)]; } console.log(removeDuplicates([1, 2, 2, 3])); 📤 Output: [1, 2, 3] 📖 Explanation: • Set automatically stores unique values only. • Spread operator ... converts it back to an array. 💡 Tip: Use this for data cleaning, API responses, or user inputs. #JavaScript #Coding #WebDevelopment #FrontendDevelopment #LearnToCode #ProgrammingTips

Day 13 #100DaysOfCode 💻 Today I learned about JavaScript Promises. Promises are objects that handle asynchronous operations and have three states: pending, fulfilled, and rejected. They make async code more readable compared to callbacks. let promise = new Promise((resolve, reject) => { let success = true; success ? resolve("Task completed!") : reject("Task failed!"); }); promise .then(result => console.log(result)) .catch(error => console.log(error)); It feels great to finally understand how async tasks can be managed smoothly with promises! #JavaScript #WebDevelopment #Akbiplob

 𝘧𝘪𝘯𝘢𝘭𝘭𝘺 𝘶𝘯𝘥𝘦𝘳𝘴𝘵𝘰𝘰𝘥 𝘩𝘰𝘸 𝙉𝙤𝙙𝙚.𝙟𝙨 𝘸𝘰𝘳𝘬𝘴 𝘣𝘦𝘩𝘪𝘯𝘥 𝘵𝘩𝘦 𝘴𝘤𝘦𝘯𝘦𝘴, 𝘢𝘯𝘥 𝘪𝘵 𝘤𝘩𝘢𝘯𝘨𝘦𝘥 𝘵𝘩𝘦 𝘸𝘢𝘺 𝘐 𝘴𝘦𝘦 𝘵𝘩𝘦 𝙟𝙖𝙫𝙖𝙨𝙘𝙧𝙞𝙥𝙩 𝙧𝙪𝙣𝙩𝙞𝙢𝙚. 🚀 Day 19 – 𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 𝐍𝐨𝐝𝐞.𝐣𝐬 𝐈𝐧𝐭𝐞𝐫𝐧𝐚𝐥𝐬 𝐰𝐢𝐭𝐡 𝐏𝐢𝐲𝐮𝐬𝐡 𝐆𝐚𝐫𝐠 Today I learned: 𝘝8 Engine compiles JavaScript into machine code. 𝘊++ bindings connect JavaScript with system-level operations. 𝗹𝗶𝗯𝘂𝘃manages asynchronous I/O, event loop, and thread pool. The Event Loop keeps 𝙉𝙤𝙙𝙚.𝙟𝙨 non-blocking. The Thread Pool handles heavy tasks like file system, DNS, and crypto. Key takeaway: 𝘕𝘰𝘥𝘦.𝘫𝘴 = 𝘝8 + 𝘊++ 𝘉𝘪𝘯𝘥𝘪𝘯𝘨𝘴 + 𝘭𝘪𝘣𝘶𝘷 + 𝘌𝘷𝘦𝘯𝘵 𝘓𝘰𝘰𝘱 + 𝘛𝘩𝘳𝘦𝘢𝘥 𝘗𝘰𝘰𝘭⚡ #WebDev #nodeJS #Javascript #ChaiAurCode

JavaScript is a single-threaded language, which means it executes one task at a time using the call stack. But it can still handle asynchronous tasks like API calls, timers, and promises. This happens because of the Event Loop. The Event Loop continuously checks if the call stack is empty. When it is empty, it takes tasks from the callback queue and moves them to the stack to be executed. Because of this system, JavaScript can run asynchronous operations without blocking the main thread, which makes web applications faster and more responsive. Learning the Event Loop helped me understand how JavaScript manages asynchronous code behind the scenes. #JavaScript #Coding #EventLoop #async

I’ve been practicing strict input validation in JavaScript. Before processing the user’s guess, I used a do…while loop to make sure the input was a number between 1 and 20. It’s a small step, but it already makes the logic feel more reliable and predictable and I’m starting to see how these basics matter a lot when building backend foundations. After all, isn’t this where real backend logic starts?

I broke my own rule today… and it paid off. I usually avoid adding new dependencies. But I needed faster validation for a complex form. Instead of reinventing everything, I used a lightweight validation helper. Saved time. Reduced bugs. Sometimes “don’t add libraries” becomes a limitation. The real rule should be: 👉 Add dependencies intentionally, not emotionally. Balance matters. Do you prefer building from scratch or using libraries? #webdev #javascript #productivity