Understanding JavaScript Objects and Prototypes

When I first learned JavaScript async code… my functions looked like this: then → then → then → then 😭 Classic Callback Hell. It was unreadable and impossible to debug. So I broke everything down and created a beginner-friendly guide on: 👉 Promises 👉 Async/Await 👉 Writing clean async code If you’re learning JS or React, this will save you hours. Read here: 🔗 https://lnkd.in/gs_yQ_Mp #JavaScript #FrontendDeveloper #Coding #LearnToCode

Early in my JavaScript journey, I spent 3 hours debugging a bug that made no sense. I updated one variable. A completely unrelated piece of state changed. I didn't touch it. I didn't reference it. Yet somehow... it changed. The fix? One word: structuredClone(). But I didn't understand WHY it worked for another year. That lack of understanding cost me: • Countless debugging hours • Mysterious React re-render issues   • State management confusion • Performance problems I couldn't explain The breakthrough came when I finally understood this: 🔑 Variables don't store objects. They store ADDRESSES. That single mental model unlocked: ✅ Why React requires immutability ✅ Why shallow copies cause bugs ✅ Why setState sometimes doesn't re-render ✅ How to optimize React performance ✅ What Redux is actually protecting against At TekBreed, we believe in teaching the why before the how. That's why I wrote "The Memory Maze: Why Your JavaScript Objects Are Haunted" — everything I wish someone had explained to me. It covers: 1️⃣ How JavaScript actually stores data in memory (Stack vs Heap) 2️⃣ The "assignment trap" that causes shared mutation bugs 3️⃣ Why shallow copies aren't enough 4️⃣ Deep copying strategies (and when NOT to use them) 5️⃣ The production pattern: structural sharing for performance The article includes interactive visualizers showing what's actually happening in memory, live coding sandboxes, and real React examples. Most importantly, it gives you the mental model that makes JavaScript state predictable instead of mysterious. Because once you see how references work, you can't unsee it. And an entire class of "impossible" bugs ceases to exist. Read it here: https://lnkd.in/dtmd4U-G If this resonates, I'd love to hear: what's the JavaScript concept you wish someone had explained better early in your career? #JavaScript #React #WebDevelopment #Programming #LearnInPublic #SoftwareEngineering

Hoisting in JavaScript can be confusing at first, but it doesn't have to be. It's often described improperly, which only adds to the confusion. In this post, I try to help shed some light on what hoisting actually is. #javascript #hoisting #coding #developer https://lnkd.in/gs2a7y3B

🚀 New Blog Post Alert! Top 10 JavaScript Array Methods You Probably Haven't Used Yet Be honest — when was the last time you used copyWithin() or reduceRight()? 😅 I wrote a blog breaking down 10 underrated JavaScript array methods with real-world examples, including: ✅ with() — immutable single item replacement ✅ flatMap() — map + flatten in one step ✅ every() & some() — clean condition checks ✅ reduceRight() — reduce but from the right ...and 6 more! Perfect for developers who want to write cleaner, smarter JavaScript. 👉 Read it here: https://lnkd.in/dakkhzwd Drop your answer to the challenge inside the blog in the comments 👇 #JavaScript #WebDevelopment #100DaysOfCode #WebDevCohort2026 #Frontend #LearnToCode

Be honest — when was the last time you used copyWithin() or reduceRight()? 😅 We all use map(), filter(), and reduce() regularly… But JavaScript has several underrated array methods that can make your code cleaner, more expressive, and more efficient. In this blog, you’ll discover: ✅ with() — immutable single-item replacement ✅ flatMap() — map + flatten in one step ✅ every() & some() — cleaner condition checks ✅ reduceRight() — reduce, but from the right …and 6 more powerful methods you probably haven’t explored deeply. If you're serious about writing smarter JavaScript, this one’s worth your time. 🔗 Check it out below #JavaScript #WebDevelopment #Frontend #Programming #Developers

Difference Between Spread and Rest in JavaScript I remember the first time I saw ... in JavaScript. I thought it was a typo. Three dots sitting there like they forgot to finish typing. Then someone said, “That’s either spread or rest.” Either? Same symbol, different meaning? My brain paused. Many developers hit this moment early in their JavaScript journey. The syntax looks identical, but the behaviour feels opposite. It’s one of those small concepts that seems confusing at first, until it clicks. And once it clicks, your confidence grows, you become a better tech professional, and the codes of other developers becomes easier to reason about. Spread (...) is used to expand values. It takes an array, object, or string and spreads its items out into individual elements. Common uses of spread: Function calls Math.max(...[1, 2, 3]) becomes Math.max(1, 2, 3) Copying arrays or objects (shallow copy) const newArray = [...oldArray] Merging arrays or objects const merged = { ...obj1, ...obj2 } Spread is often used to maintain immutability, especially in frameworks like React(allowing developers to update data without directly altering the original (previous) state). Rest (...) is used to collect values. It takes multiple individual values and packs them into a single array or object. Common uses of rest: Function parameters function myFunc(...args) {   // args is an array of all arguments } Destructuring const [first, ...rest] = array; In simple terms: - Spread spreads things out - Rest gathers things together Spread and rest are simple tools, but they unlock powerful patterns in modern JavaScript. Understanding them is not just about syntax, it’s about thinking clearly about how data moves in your code. If this explanation helped, give it a like so more developers can see it. Repost it for someone learning JavaScript. And drop your answer in the comments - which one confused you more when you first learned it? Let’s compare experiences.

10 Advanced JavaScript Questions Most Devs Can't Answer! If you've mastered the basics it's time to go deeper. Here are 10 advanced JS concepts that separate good developers from great ones 𝟭. 𝗠𝗲𝗺𝗼𝗿𝘆 𝗛𝗲𝗮𝗽 & 𝗚𝗮𝗿𝗯𝗮𝗴𝗲 𝗖𝗼𝗹𝗹𝗲𝗰𝘁𝗶𝗼𝗻 - The JS engine uses mark-and-sweep to free unused memory. Know how memory leaks happen and how to avoid them. 𝟮. 𝗪𝗲𝗮𝗸𝗠𝗮𝗽 & 𝗪𝗲𝗮𝗸𝗦𝗲𝘁 - Unlike Map/Set, these hold weak references allowing GC to reclaim objects. Great for private data & leak-free caching. 𝟯. 𝗣𝗿𝗼𝘅𝘆 & 𝗥𝗲𝗳𝗹𝗲𝗰𝘁 𝗔𝗣𝗜𝘀 - Intercept and customize fundamental object operations (get, set, delete). This is what powers Vue 3's reactivity system. 𝟰. 𝗚𝗲𝗻𝗲𝗿𝗮𝘁𝗼𝗿𝘀 & 𝗜𝘁𝗲𝗿𝗮𝘁𝗼𝗿𝘀 - Functions that can pause and resume execution. They enable lazy evaluation, infinite sequences and they're the foundation of async/await. 𝟱. 𝗧𝗲𝗺𝗽𝗼𝗿𝗮𝗹 𝗗𝗲𝗮𝗱 𝗭𝗼𝗻𝗲 (𝗧𝗗𝗭) - let and const ARE hoisted but accessing them before declaration throws a ReferenceError. That window is the TDZ. 𝟲. 𝗖𝘂𝗿𝗿𝘆𝗶𝗻𝗴 & 𝗣𝗮𝗿𝘁𝗶𝗮𝗹 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 - Break multi-argument functions into chains of single-argument calls. The backbone of functional programming in JS. 𝟳. 𝗠𝗶𝗰𝗿𝗼𝘁𝗮𝘀𝗸 𝘃𝘀 𝗠𝗮𝗰𝗿𝗼𝘁𝗮𝘀𝗸 𝗤𝘂𝗲𝘂𝗲 - Promises resolve in the microtask queue (runs before the next macrotask). setTimeout is a macrotask. Order matters more than you think. 𝟴. 𝗦𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗮𝗹 𝗦𝗵𝗮𝗿𝗶𝗻𝗴 𝗶𝗻 𝗜𝗺𝗺𝘂𝘁𝗮𝗯𝗶𝗹𝗶𝘁𝘆 - Libraries like Immer don't deep-clone everything they reuse unchanged branches. Efficient immutability at scale. 𝟵. 𝗧𝗮𝗴𝗴𝗲𝗱 𝗧𝗲𝗺𝗽𝗹𝗮𝘁𝗲 𝗟𝗶𝘁𝗲𝗿𝗮𝗹𝘀 - Process template strings with a custom function at parse time. This is how styled-components, GraphQL, and i18n libraries work. 𝟭𝟬. 𝗣𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗲 𝗣𝗼𝗹𝗹𝘂𝘁𝗶𝗼𝗻 - Malicious code can inject properties into Object.prototype, corrupting all objects. A real CVE-level security risk ,learn how to defend against it.

Day 25: Currying in JavaScript 🍛 Currying sounds complicated… But it’s actually a powerful functional programming technique. 🔹 What is Currying? Currying is: Transforming a function that takes multiple arguments into a sequence of functions that take one argument at a time. Instead of this 👇 function add(a, b, c) { return a + b + c; } add(2, 3, 4); // 9 We do this 👇 function add(a) { return function (b) { return function (c) { return a + b + c; }; }; } add(2)(3)(4); // 9 One argument at a time 🔹 Why Use Currying? ✔ Improves reusability ✔ Helps create specialized functions ✔ Enables function composition ✔ Common in functional programming Real Practical Example function multiply(a) { return function (b) { return a * b; }; } const double = multiply(2); const triple = multiply(3); console.log(double(5)); // 10 console.log(triple(5)); // 15 Here: multiply(2) creates a reusable function That’s powerful abstraction 🔥Modern ES6 Version (Cleaner) const add = a => b => c => a + b + c; add(1)(2)(3); // 6 Short and elegant. 🔹 Currying vs Partial Application 👉 Currying → Always single argument functions 👉 Partial Application → Fix some arguments, not necessarily one by one Example of partial application: function add(a, b) { return a + b; } const add5 = add.bind(null, 5); console.log(add5(10)); // 15 🧠 Interview Insight Currying is possible in JavaScript because: ✔ Functions are first-class citizens ✔ Functions can return functions ✔ Closures preserve outer scope values 🔥 Where It’s Used? Redux Functional libraries like Lodash Middleware patterns Advanced React patterns #JavaScript #Currying #FunctionalProgramming #Frontend #WebDevelopment #LearnInPublic