JavaScript Functions: Declarations vs Expressions Explained

📣 𝗡𝗲𝘅𝘁 𝗕𝗹𝗼𝗴 𝗶𝘀 𝗛𝗲𝗿𝗲! ⤵️ Arrow Functions in JavaScript — A Simpler Way to Write Functions ⚡🧠 Regular functions work fine. But when logic becomes small and frequent, typing all that syntax starts feeling heavy. This blog explains arrow functions in a clear, beginner-friendly way — focusing on syntax, mental models, and real usage. 🔗 𝗥𝗲𝗮𝗱 𝗵𝗲𝗿𝗲: https://lnkd.in/gMBAZxX5 𝗧𝗼𝗽𝗶𝗰𝘀 𝗰𝗼𝘃𝗲𝗿𝗲𝗱 ✍🏻: ⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺ ⇢ What arrow functions actually are ⇢ Converting normal functions to arrow step by step ⇢ Basic syntax and parameter rules ⇢ Implicit return — the real magic ⇢ When implicit return does NOT work ⇢ Using arrow functions in map(), filter(), and callbacks ⇢ Common beginner mistakes and how to fix them ⇢ When to use arrow functions vs regular functions ⇢ Practical examples for faster understanding 💬 If functions still feel verbose or repetitive, this article helps you write cleaner and more modern JavaScript. #ChaiAurCode #JavaScript #ArrowFunctions #WebDevelopment #ProgrammingBasics #Beginners #LearningInPublic #100DaysOfCoding

Day 3 — JavaScript is humbling me in the best way. Started with the basics I thought I already knew. Turns out I knew the syntax but not the why. var vs let vs const — I used to just pick randomly. Now I get why const is default and var is basically legacy. The thing that actually clicked today: arrow functions aren't just shorter syntax. They handle 'this' differently. That's why everyone prefers them in certain situations. Also spent an hour on map, filter, and reduce with real data instead of fake tutorials. Way more useful. Favourite thing I learned: optional chaining (?.) — it's saved me from so many "cannot read property of undefined" errors already. Drop a JavaScript concept below that confused you at first 👇 #javascript #webdevelopment #frontenddeveloper #coding

Day 1 of 30 days of javascript challenge. problem-2667 Problem - Write a function createHelloWorld that returns another function, that returns "Hello World" As this is my first code, I revised my notes on javascript scope. ☑️ Function scope - Any variables declared inside a function body cannot be accessed outside the function body, but global variables can be used inside function body ☑️ Block scope - Any variable declared inside { } cannot be used outside the { } block, although it supports only let and const keyword, var can be used ☑️ Lexical scope - A variable declared outside a function can be accessed inside another function defined after the variable declaration. (The opposite is not true ) This problem uses the concept of closures and higher order functions. Please feel free to discuss where can I improve the code or if you have a different perspective, comment below your views. #javascript #coding #development #motivation #goals #leetcode #webdevelopment

🚨 JavaScript finally started making sense after this… For a long time, I was just using functions in JS. But recently, I learned about: 👉 Scope 👉 Closures 👉 Higher Order Functions (HOF) And things clicked differently. 💡 Here’s what changed my understanding: ✅ Scope It’s not just about variables — it’s about where your code can access data ✅ Closures -> This blew my mind 🤯 A function doesn’t just execute… It remembers the environment where it was created. 👉 Even after the outer function is gone. ✅ Higher Order Functions Functions in JavaScript are not just “callable” They are: ✔ Passed as arguments ✔ Returned from other functions ✔ Stored like values 💡 The biggest shift for me: 👉 “Functions are not just actions, they are values with memory. They are first-class citizens in JavaScript” If you’re learning JavaScript: Don’t rush. These concepts feel hard at first… but once they click, everything changes. Course Instructor: Rohit Negi | Youtube Channel: CoderArmy. #JavaScript #WebDevelopment #Closures #fullstackdevelopment #LearnInPublic #coding

𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗠𝘆𝘀𝘁𝗲𝗿𝘆 𝗦𝗼𝗹𝘃𝗲𝗱: 𝗧𝗵𝗲 𝗧𝗲𝗺𝗽𝗼𝗿𝗮𝗹 𝗗𝗲𝗮𝗱 𝗭𝗼𝗻𝗲 (𝗧𝗗𝗭) 🚫 Ever tried to use a variable before you've actually created it and been met with a frustrating ReferenceError? You've just met the Temporal Dead Zone, a classic JavaScript confusing point! Here's a simple breakdown of what it is and why it matters: What is it? It's the region in your code from the start of a scope until a variable is declared using let or const. During this "temporal" time, you absolutely cannot access that variable. ⏳ Why does it exist? JavaScript wants to prevent you from using uninitialized values, which can lead to buggy, unpredictable code. The TDZ is a safety net that catches these errors early. 🧱 Wait, isn't it the same as hoisting? No! Hoisting moves declarations to the top of the scope, but only let and const create this mandatory TDZ before initialization. For var, you can access it (and get undefined). The TDZ makes your code much safer and more readable. ✨ What's the best way to handle it? 𝗘𝗮𝘀𝘆: always declare your variables at the very top of their scope! This makes your intentions clear to both the engine and other developers. This is a crucial step for writing efficient, professional-grade JavaScript code. 🤩 #JavaScript #WebDevelopment #CodingTips #SoftwareEngineering #TemporalDeadZone #Hoisting #Let #Const #LearningToCode #ProgrammingConcepts

I ran a small JavaScript experiment today, and it was a good reminder that performance often hides inside simple concepts. I used the same function twice with the same inputs. The first call took noticeable time. The second call returned almost instantly. Nothing changed in the inputs. Nothing changed in the output. The only difference was that the second time, JavaScript didn’t need to do the work again. That’s the beauty of memoization. Instead of recalculating, it remembers the previous result and returns it from cache. What looks like a small optimization in code can make a big difference in how efficiently an application behaves. The deeper I go into JavaScript, the more I realize: the real power is not just in writing code — it’s in understanding how to make code smarter. #JavaScript #WebDevelopment #FrontendDevelopment #Memoization #Closures

🚀 Just solved the "Best Time to Buy and Sell Stock" problem in JavaScript! Today I worked on improving my problem-solving skills by implementing a solution to calculate the maximum profit from stock prices. 🔍 Problem: Given an array of prices, determine the maximum profit you can achieve by buying and selling once. 💡 Approach: I started with a brute-force solution using nested loops to compare every possible buy/sell pair. While not the most optimal (O(n²)), it helped me deeply understand the problem before optimizing. 📌 Example: Input: [10, 1, 5, 6, 7, 1] Output: 6 🧠 Key takeaway: Sometimes starting simple is the best way to build strong intuition before moving to more efficient solutions. 👉 Check out my code and more JavaScript patterns here: https://lnkd.in/ej4fNeZs #JavaScript #Coding #ProblemSolving #100DaysOfCode #WebDevelopment #LearningInPublic

🚀 Day 7/100 of #100DaysOfCode Today was all about strengthening JavaScript fundamentals — revisiting concepts that seem simple but are often misunderstood. 🔁 map() vs forEach() Both are used to iterate over arrays, but they serve different purposes: 👉 map() Returns a new array Used when you want to transform data Does not modify the original array Example: const doubled = arr.map(num => num * 2); 👉 forEach() Does not return anything (undefined) Used for executing side effects (logging, updating values, etc.) Often modifies existing data or performs actions Example: arr.forEach(num => console.log(num)); ⚔️ Key Difference: Use map() when you need a new transformed array Use forEach() when you just want to loop and perform actions ⚖️ == vs === (Equality in JS) 👉 == (Loose Equality) Compares values after type conversion Can lead to unexpected results Example: '5' == 5 // true 😬 👉 === (Strict Equality) Compares value AND type No type coercion → safer and predictable Example: '5' === 5 // false ✅ 💡 Takeaway: Small concepts like these make a big difference in writing clean, bug-free code. Mastering the basics is what separates good developers from great ones. 🔥 Consistency > Intensity On to Day 8! #JavaScript #WebDevelopment #CodingJourney #LearnInPublic #Developers #100DaysOfCode #SheryiansCodingSchool #Sheryians

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

You don’t need 100 JavaScript concepts. You need these 14. Seriously. Most beginners jump from tutorial to tutorial… but still struggle with real problems. The reason? They ignore the basics that actually matter. These 14 Array Methods alone can level up your JavaScript: • push() / pop() • shift() / unshift() • slice() / splice() • map() / filter() / reduce() • forEach() • find() / findIndex() • includes() / sort() Once you understand these properly: → Your logic improves → Your code becomes cleaner → Interviews feel easier No fancy tricks. Just strong fundamentals. I use these almost every day while building projects. And honestly… This is where real confidence comes from. 📌 Save this — you’ll thank yourself later 📌 Share with a developer who needs this Want simple explanations + examples for each? Comment “ARRAY” — I’ll send you everything I use. #javascript #frontenddeveloper #webdevelopment #mernstack #reactjs #coding #programming #learnincode