JavaScript Revision: Core Concepts & Hitesh Sir's Explanation

Day 6/30 – Build Your Own Filter Function in JavaScript 🧠 | No Array.filter() 🧠 Problem: Implement a filtering function without using Array.filter(). The function should: Take an array arr Use a function fn(value, index) Return a new array containing only truthy results ➡️ filteredArr includes elements where Boolean(fn(arr[i], i)) === true ✨ This challenge helped me deeply understand: Truthy vs Falsy values Conditional array processing How JavaScript array methods work internally Rebuilding core methods = stronger fundamentals 💪 💬 Share your approach or optimize mine in the comments! #JavaScript #30DaysOfJavaScript #CodingChallenge #ArrayFilter #JSLogic #LeetCode #WebDevelopment #LearnToCode #CodeEveryday #DeveloperJourney #Programming #TechCommunity JavaScript custom filter Implement filter without filter Truthy and falsy JavaScript JavaScript array filtering logic LeetCode JavaScript solution JS interview preparation Beginner JavaScript practice Daily coding challenge

Binary Addition in JavaScript – Manual Approach 👉 Day 92 / Day 93 👈 40🔥 Binary addition manually in JavaScript instead of using built-in conversion methods. The idea is simple: Traverse both binary strings from right to left Add corresponding digits along with carry Maintain carry for the next iteration Build the result string from left #JavaScript #DataStructures #Algorithms #DSA #ProblemSolving #CodingPractice #FrontendDeveloper #InterviewPreparation #100DaysOfCode #Binary

🚀 JavaScript Basics – var vs let vs const While revising core concepts, I refreshed my understanding of variable declarations in JavaScript. Here’s a quick breakdown: 🔹 var • Function scoped • Can be redeclared • Can be updated 🔹 let • Block scoped • Cannot be redeclared in the same scope • Can be updated 🔹 const • Block scoped • Cannot be redeclared • Cannot be reassigned 💡 Best Practice: Use const by default. Use let when the value needs to change. Avoid using var in modern JavaScript. Strong fundamentals = Strong development skills. #javascript #webdevelopment #frontenddeveloper #coding #learninginpublic #100DaysOfCode

Day 37/100 🚀 Object basics in JavaScript — creating objects, accessing properties, using operators, and understanding objects vs primitive data types. #100DaysOfCode #JavaScript #WebDev

Clean code starts with clean data. The filter() method in JavaScript helps you keep only what matters ✨ Simple logic. Readable code. Better performance. #JavaScript #FilterMethod #FrontendDeveloper #WebDevelopment #CleanCode #CodingTips

Clean code starts with clean data. The filter() method in JavaScript helps you keep only what matters ✨ Simple logic. Readable code. Better performance. #JavaScript #FilterMethod #FrontendDeveloper #WebDevelopment #CleanCode #CodingTips

Real-world logic isn’t binary. The else if statement in JavaScript lets your code handle multiple conditions clearly and efficiently 🧠 More conditions. Better decisions. #JavaScript #ElseIf #ProgrammingLogic #FrontendDeveloper #WebDevelopment #CodingTips

Many JavaScript developers still misuse var, let, and const – which leads to bugs, memory issues, and unpredictable behavior. I’ve created a complete video explaining: • Scope differences   • Hoisting   • Redeclaration vs Reassignment   • When to use var, let, or const   • Best practices for clean JavaScript  If you’re learning JavaScript or preparing for interviews, this video will help you master the fundamentals. 📌 Watch the full video here: https://lnkd.in/gThHSyt9 #JavaScript #WebDevelopment #FrontendDeveloper #Programming #LearnToCode #SoftwareEngineering #JS #Developers

Tiny JavaScript methods, massive clarity. Today’s snippet breaks down how join, substring, slice, and splice actually behave — same syntax, very different output. If you’ve ever been confused why slice doesn’t modify the array but splice does, this one is for you. Clean examples, zero fluff, straight logic. Save this for revision and share it with someone learning JavaScript fundamentals. Follow for more daily JS clarity and real interview-level concepts. #JavaScript #JSBasics #FrontendDevelopment #WebDeveloper #CodingSnippets #LearnJavaScript #DeveloperTips #ProgrammingLogic #CodeDaily

Day 10/30 – JavaScript Once Function 🧠 | Ensure a Function Runs Only Once💻🚀 🧠 Problem: Given a function fn, return a new function that: Executes fn only once Returns the result on the first call Returns undefined on all subsequent calls ✨ This challenge helped me understand: Closures & state preservation Function wrappers How real-world features like one-time events, initialization logic, and API guards work This pattern is commonly used in: ⚡ Event listeners ⚡ Authentication flows ⚡ Performance optimization 💬 Where would you use a “run once” function? Comment below 👇 #JavaScript #30DaysOfJavaScript #CodingChallenge #Closures #JSLogic #LeetCode #WebDevelopment #LearnToCode #CodeEveryday #DeveloperJourney #Programming #TechCommunity JavaScript once function Call function only once JS JavaScript closures example Higher order functions JavaScript LeetCode JavaScript solution JS interview questions Beginner JavaScript practice Daily coding challenge