Hitesh Choudhary's JavaScript Essentials with Hitesh Choudhary

Today I practiced the Best Time to Buy and Sell Stock problem in JavaScript. This problem looks simple at first, but it is a great exercise for improving algorithmic thinking. The goal is to track the best moment to buy and then update the maximum profit while scanning the array once. What this reminded me: understanding the reason behind a pattern is more important than just memorizing solutions. I’m sharing more JavaScript pattern exercises here: GitHub: https://lnkd.in/ej4fNeZs #JavaScript #Coding #Algorithms #ProblemSolving #SoftwareEngineer #GitHub #LearningInPublic

🚀 Day 5/100 — #100DaysOfCode Today was all about strengthening my JavaScript fundamentals 💻 Instead of rushing ahead, I took time to revise the core concepts that form the backbone of programming. 📚 What I revised: 🧠 Core Concepts • Variables & Declarations • Data Types & JavaScript Type System ⚡ Logic Building • Operators • Control Flow (if-else, conditions) 🔁 Iteration • Loops (for, while) ⚙️ Functions • Writing reusable and structured code 📦 Data Structures • Arrays — handling collections of data • Objects — organizing data in key-value form 💡 Key Insight: Strong fundamentals make complex problems easier to solve. 🔥 Day 5 complete. Staying consistent and building step by step. #JavaScript #WebDevelopment #CodingJourney #BuildInPublic #Consistency

🚀 Day 15 of #100DaysOfCode Today was all about mastering two powerful JavaScript concepts that make code cleaner, smarter, and more expressive: 👉 Array Destructuring 👉 Spread Operator 💡 1. Array Destructuring No more messy indexing! You can unpack values from arrays in a clean way: const arr = [10, 20, 30]; const [a, b, c] = arr; console.log(a, b, c); // 10 20 30 You can even skip values or set defaults: const [x, , z = 50] = [5, 15]; console.log(x, z); // 5 50 ⚡ Cleaner code = better readability. 💡 2. Spread Operator (...) This tiny syntax unlocks big power 💥 👉 Copy arrays: const arr1 = [1, 2, 3]; const arr2 = [...arr1]; 👉 Merge arrays: const a = [1, 2]; const b = [3, 4]; const merged = [...a, ...b]; 👉 Add elements easily: const nums = [1, 2, 3]; const updated = [...nums, 4]; 🔥 No loops. No push chaos. Just elegance. ✨ Key Takeaway: Destructuring simplifies access. Spread operator simplifies manipulation. Together? They make your JavaScript feel like magic 🪄 📈 Consistency is the real superpower. Showing up every day. Learning every day. #JavaScript #WebDevelopment #CodingJourney #100DaysOfCode #LearnInPublic #Developers #LearningInPublic Sheryians Coding School Sheryians Coding School Community

Completed Episode 9 " libuv and Event loop " of Namaste Node.js season -1 #NamasteNodejs by Akshay Saini 🚀 learned Node.js handles asynchronous operations efficiently using libuv and the event loop 🔥 libuv libuv enables Node.js to handle asynchronous operations. It powers the event loop and thread pool to achieve non-blocking behavior. 🔁 Event Loop Continuously checks the call stack and callback queues. Executes callbacks only when the call stack is empty. 📦 Callback Queue Stores callbacks of completed asynchronous tasks. The event loop pushes them to the call stack for execution. 🧵 Thread Pool Handles heavy operations like file system and DNS tasks. Prevents blocking the main thread by running tasks in background threads. ⚡ Non-Blocking I/O Async tasks are offloaded to libuv or the OS. JavaScript continues execution without waiting for results. 🔄 Event Loop Phases ⏱️ Timers Phase Executes callbacks of scheduled timers. 📡 Poll Phase (Most Important) Handles I/O callbacks. Also waits for new tasks if none are available. ⚡ Check Phase Executes immediate callbacks scheduled after the poll phase. ❌ Close Phase Handles cleanup callbacks. ⚠️ Microtasks (High Priority) 🔹 process.nextTick() Executed immediately after current execution. Has the highest priority. 🔹 Promises Executed after process.nextTick but before event loop phases. 🔁 Microtask Rule All microtasks are executed before moving to the next phase. #NodeJS #JavaScript #BackendDevelopment #WebDevelopment #FullStackDeveloper #SoftwareEngineering #Programming #Coding #Developers #Tech #AsyncProgramming #EventLoop #libuv #NonBlocking #SystemDesign #LearnToCode #CodingLife #DeveloperLife #TechCommunity #100DaysOfCode #CodeNewbie #DevCommunity #ProgrammingLife #SoftwareDeveloper #Engineering #TechEducation #CSConcepts #InterviewPrep #CodingInterview #LearnJavaScript

In the last class, I got a complete overview of TypeScript and learned some very useful concepts that help in writing clean and structured code. Here’s what I learned: 1. Working with Deno 2. Understanding data types, functions, arrays & objects 3. Using enums and tuples 4. Type aliases & interfaces for better structure 5. Type narrowing & union types for smarter logic 6. Handling nullable values & nullish coalescing 7. Writing flexible code using generics Each concept is helping me think more clearly while coding and avoid common JavaScript mistakes. Excited to start applying these in real projects and keep improving every day Thanks to Hitesh Choudhary Sir, Piyush Garg Sir and Chai Aur Code #TypeScript #WebDevelopment #LearningJourney #FrontendDeveloper #Coding

🚀 Weekly Progress Update Last week was all about strengthening my JavaScript fundamentals and improving problem-solving skills. Here’s what I worked on: ✅ Deep dive into Event Handling Event Bubbling Event Capturing Event Delegation ✅ Practiced and solved 40+ string-based problems to improve logic building ✅ Gained hands-on experience with: DOM Manipulation BOM (Browser Object Model) ✅ Built a form project applying real-world concepts of events, DOM, and validation This week helped me better understand how JavaScript works behind the scenes and how to write cleaner, more efficient code. Looking forward to learning more and building stronger projects ahead 💻🔥 #JavaScript #WebDevelopment #LearningJourney #FrontendDeveloper #Coding #100DaysOfCode

✨ Day 7 – Loops finally made sense! I used to feel confused seeing different loops in JavaScript… "for", "for...of", "for...in" — all looked similar at first. But today, after practicing, something finally clicked 💡 Now I understand: • "for" → when I know how many times to run • "for...of" → to get values from arrays • "for...in" → to get indexes or object keys Small step, but a big clarity moment for me. Still learning, still improving… and staying consistent 🔥 #Day7 #JavaScript #Loops #LearningJourney #Coding #Consistency

𝐓𝐡𝐞 𝐜𝐚𝐥𝐥 𝐬𝐭𝐚𝐜𝐤 𝐡𝐚𝐬 𝐧𝐨 𝐩𝐚𝐭𝐢𝐞𝐧𝐜𝐞. 𝐈𝐭 𝐞𝐱𝐞𝐜𝐮𝐭𝐞𝐬 𝐞𝐯𝐞𝐫𝐲𝐭𝐡𝐢𝐧𝐠 — 𝐢𝐧𝐬𝐭𝐚𝐧𝐭𝐥𝐲, 𝐫𝐮𝐭𝐡𝐥𝐞𝐬𝐬𝐥𝐲, 𝐢𝐧 𝐨𝐫𝐝𝐞𝐫. So what happens when you need a 𝐝𝐞𝐥𝐚𝐲? That's where I hit a wall. If JavaScript is single-threaded and the call stack never pauses — how does '𝐬𝐞𝐭𝐓𝐢𝐦𝐞𝐨𝐮𝐭' even work? Turns out, it doesn't live in JavaScript at all. 𝐖𝐞𝐛 𝐀𝐏𝐈𝐬 — 𝐬𝐞𝐭𝐓𝐢𝐦𝐞𝐨𝐮𝐭, 𝐟𝐞𝐭𝐜𝐡( ), 𝐃𝐎𝐌 𝐞𝐯𝐞𝐧𝐭𝐬, 𝐥𝐨𝐜𝐚𝐥𝐒𝐭𝐨𝐫𝐚𝐠𝐞 — are gifts from the browser, not the language. The browser quietly hands them off, runs them in the background, then places the result into a 𝐂𝐚𝐥𝐥𝐛𝐚𝐜𝐤 𝐐𝐮𝐞𝐮𝐞 . And here's the elegant part: The 𝐄𝐯𝐞𝐧𝐭 𝐋𝐨𝐨𝐩 sits there, watching. The moment the call stack is empty, it picks up the waiting callback functions and pushes it in. That's it. No magic. Just a disciplined handoff between three moving parts. JavaScript doesn't wait — but the browser builds the patience "around" it. 𝐓𝐚𝐤𝐞𝐚𝐰𝐚𝐲𝐬 : → 𝐓𝐡𝐞 𝐜𝐚𝐥𝐥 𝐬𝐭𝐚𝐜𝐤 𝐞𝐱𝐞𝐜𝐮𝐭𝐞𝐬 𝐟𝐚𝐬𝐭. 𝐍𝐞𝐯𝐞𝐫 𝐚𝐬𝐬𝐮𝐦𝐞 𝐢𝐭 𝐰𝐚𝐢𝐭𝐬. → 𝐖𝐞𝐛 𝐀𝐏𝐈𝐬 𝐚𝐫𝐞 𝐛𝐫𝐨𝐰𝐬𝐞𝐫-𝐩𝐨𝐰𝐞𝐫𝐞𝐝, 𝐚𝐜𝐜𝐞𝐬𝐬𝐞𝐝 𝐯𝐢𝐚 𝐭𝐡𝐞 𝐠𝐥𝐨𝐛𝐚𝐥 "𝐰𝐢𝐧𝐝𝐨𝐰" 𝐨𝐛𝐣𝐞𝐜𝐭. → 𝐓𝐡𝐞 𝐞𝐯𝐞𝐧𝐭 𝐥𝐨𝐨𝐩 𝐨𝐧𝐥𝐲 𝐚𝐜𝐭𝐬 𝐰𝐡𝐞𝐧 𝐭𝐡𝐞 𝐜𝐚𝐥𝐥 𝐬𝐭𝐚𝐜𝐤 𝐢𝐬 𝐜𝐥𝐞𝐚𝐫. #JavaScript #SoftwareEngineering #DeveloperJourney #LearningInPublic #Programming #TechCommunity #WebDevelopment

hi connections Day 13 of 30: Mastering the "Sleep" Function in JavaScript! Today’s LeetCode challenge was a deep dive into asynchronous timing. ⏳ The Goal: Write an asynchronous function that sleeps for a specified number of milliseconds. The Lesson: JavaScript is single-threaded, so we can't just "pause" the whole engine. Instead, we use Promises and setTimeout to tell the engine: "Go do other tasks, and come back to this specific line of code after X milliseconds." This is a vital pattern for: ✅ Rate-limiting API calls to stay within quota. ✅ Adding intentional delays for better UI/UX (like loading states). ✅ Polling a server for updates at specific intervals. Understanding the difference between blocking and non-blocking code is what makes for a smooth, high-performance application! #JavaScript #WebDevelopment #AsyncProgramming #LeetCode #CodingChallenge #Day13 #SoftwareEngineering #FrontendTips

Building Subsets on Day 226 Today Today is day 226 of my coding journey and I focused on solving the Power Set problem using JavaScript. This involves finding every possible combination of elements from a given array including the empty set. I used the Backtracking technique to explore all paths. The logic starts with an empty array and then adds elements one by one. After exploring a specific path I used the pop method to remove the last element. This is the unchoose step that allows the code to go back and try a different number. One important thing I practiced today is how to use the spread operator to create a copy of the current path before adding it to the result. This ensures that the final list contains the correct values instead of just references to an empty array. Understanding how recursion builds a state space tree makes solving these types of problems much clearer. I solved this LeetCode question today: LeetCode 78 Subsets #DSAinJavaScript #365daysOfCoding #JavaScriptLogic #LeetCode #BacktrackingAlgorithms #Recursion #ProblemSolving #CodingChallenge #WebDevelopment #SoftwareEngineering #DataStructures #LogicBuilding #TechLearning #JSAlgorithms #SoftwareDevelopment #CodingSkills #DailyCoding #ArrayManipulation #FullStackDeveloper #ProgrammingJourney