https://lnkd.in/diyD-KU3 slice vs splice in JavaScript — a small concept that makes a big difference. Understanding which array methods mutate data and which don’t is crucial for writing predictable and bug-free code, especially in frontend frameworks. Sharing a quick visual breakdown for anyone revising JavaScript fundamentals. Which array method confused you the most when you started? #JavaScriptDevelopers #FrontendDevelopment #ProgrammingBasics #DevelopersOfLinkedIn #ContinuousLearning

Understanding var, let, and const in JavaScript ⚡ Many beginners ask: Which one should I use — var, let, or const? 👉 var Function scoped Can be re-declared & updated Causes unexpected bugs ⚠️ Avoid using in modern JavaScript 👉 let Block scoped Can be updated but not re-declared Best for values that change 👉 const Block scoped Cannot be re-assigned Best for fixed references 💡 Rule of Thumb: Use const by default, use let when value needs to change, avoid var. Strong fundamentals = clean & bug-free code 🚀 #JavaScript #WebDevelopment #FrontendDeveloper #LearnJS

🚀 JavaScript Fundamentals: Small Differences, Big Impact While practicing JavaScript patterns and loops, I clearly understood how small changes can completely affect output and logic. 🔹 Difference between let and var in for loops Using var: Function scoped Variable leaks outside the loop Can cause unexpected bugs (especially in async code) Allows redeclaration Using let: Block scoped Limited only to the loop block Safer and predictable Preferred in modern JavaScript 👉 Best practice: Always use let in loops. 🔹 Difference between console.log inside vs outside inner loop console.log INSIDE inner loop: Prints while the row is being built Executes multiple times per row Produces triangle / step-by-step patterns console.log OUTSIDE inner loop: Prints after completing one row Executes once per row Produces square, rectangle, or aligned patterns 🧠 Key Learnings Loop behavior depends on scope Pattern output depends on where you print Understanding fundamentals avoids logical mistakes in interviews 🙏 Thanks to my mentor sanjeev ch for guiding me to focus on logic, not just output. #JavaScript #WebDevelopment #CodingFundamentals #LearningJavaScript

JavaScript Notes to Escape Tutorial Hell (14/20) JavaScript is a single-threaded language. It has one call stack and can only do one thing at a time. So, why doesn't your entire browser freeze every time you click a button or wait for a timer? The answer is the Callback Function. It handles timers, clicks, and async tasks smoothly. This deck explains: - What callback functions really are - How callbacks enable asynchronous behavior - Why setTimeout and event listeners don’t block execution - How closures maintain state (like a click counter) - How callbacks interact with the call stack - Why unmanaged event listeners can cause memory issues Callbacks are powerful, but only when you understand how they work internally. #JavaScript #WebDevelopment #Callbacks #Asynchronous #CodingJourney #SoftwareEngineering #InterviewPrep #FrontendDeveloper

🤔 If JavaScript allows creating objects without classes, why do we still need classes? I explored this question in my second blog post, along with a clear explanation of instance functions vs static functions in JavaScript. Learning through doubts helps strengthen concepts — Learn via Unlearning. Would love to hear your thoughts! 🔗 Blog link: https://lnkd.in/gVA4KCXb #JavaScript #LearningInPublic #WebDevelopment

JavaScript Notes to Escape Tutorial Hell (7/20) If you don’t understand scope, JavaScript will feel unpredictable. One of the most confusing parts of JavaScript is figuring out where you can access a specific variable. Why can an inner function access a variable from its parent, but the parent can't access variables from the child? The answer lies in the Lexical Environment. This deck explains: - What a lexical environment really is - How local memory links to its parent environment - How JavaScript searches for variables step by step - What the scope chain is and how it works - Why scope depends on where functions are written, not how they’re called If you understand the Scope Chain, you’ll never struggle with ReferenceError in nested functions again. #JavaScript #WebDevelopment #ScopeChain #LexicalScope #CodingJourney #SoftwareEngineering #LearningInPublic #FrontendDeveloper

🚀 JavaScript Practice Project Built a Min–Max Price Range Slider using JavaScript. Learned DOM manipulation, event handling, input validation, and how to enforce a fixed gap between values while keeping text inputs and range sliders in sync. Still learning, one step at a time. 💪 🖇️ :https://lnkd.in/dvVY2yVY #frontend #codinglife #javascript #html #React

When I first learned JavaScript, string methods looked simple — but now I see how often they’re used in real logic and validations. Revising and sharing key JS string methods today. #JavaScript #CodingJourney #WebDev #LearningInPublic

JavaScript Practice: Flattening an Array (Without flat()) Today, I worked on a simple but important JavaScript exercise: flattening an array. The goal was to transform a mixed array (numbers + nested arrays) into a single-level array, without using Array.prototype.flat(), to better understand loops and array manipulation. 💡 What this exercise helped me practice: Iterating over arrays with for...of Detecting arrays using Array.isArray() Using the spread operator (...) to merge elements Writing clean and readable logic ✅ Example output: [1, 2, 3, 4, 25, 6, 7, 5] This kind of small exercise is great for building strong fundamentals in JavaScript and improving problem-solving skills step by step. 📂 You can find the full code here: 👉 https://lnkd.in/ej4fNeZs #JavaScript #CodingPractice #WebDevelopment #LearningInPublic #Frontend #ProblemSolving #GitHub

#Day 26 / 100 – JavaScript Practice & Error Handling 📌 Today I focused on understanding modern JavaScript behavior and applied it by building a Login Form with validation. ✅worked on today: • Deep understanding of this keyword • Error handling using try & catch • Writing cleaner code with arrow functions • Learned implicit return in arrow functions • Used setTimeout and setInterval for timed execution • Explored how this behaves inside arrow functions • Practiced questions to strengthen concepts 🔧 Practice: Built a Login Form UI and handled input validation & errors using JavaScript logic. Day 26 complete ✅ 👍🏻 🚀 #Day26 #JavaScript #ErrorHandling #ArrowFunctions #FrontendDevelopment #LearningByDoing #100DaysOfCode