JavaScript Variables & Data Types Explained

Variables in JavaScript Most beginners learn variables in JavaScript… But very few understand values first. And without understanding values, JavaScript can feel confusing. Let’s make it simple. 👇 In JavaScript, a value is simply data stored in memory. When you write code like: let age = 25; 👉 age = variable 👉 25 = value Here are some common JavaScript values: • Number → 10, 3.14, 100 • String → "Hello", "JavaScript" • Boolean → true or false • Null / Undefined → empty or missing values • Objects & Arrays → complex values like {} and [] Think of it like this: 📦 Variable = Box 🎁 Value = What’s inside the box JavaScript programs run by creating, storing, and using values all the time. If you understand values well, the rest of JavaScript becomes much easier. #JavaScript #WebDevelopment #FrontendDevelopment #ProgrammingBasics #JavaScriptTips #LearnToCode #CodingForBeginners #SoftwareDevelopment #JSDeveloper #TechEducation

🚀 30 Days of JavaScript – Day 16 Starting to build more structured programs using JavaScript. 💡 Today’s Project: Contact Manager This program allows users to: • Add contacts (name & phone) • View stored contacts 🧠 Concepts Used: • functions • arrays of objects • oops • menu-driven logic This helped me understand how to organize code into reusable functions. 🎥 Demo below 👇 Full source code in the First comment. #JavaScript #WebDevelopment #CodingJourney #LearningJavaScript #ProblemSolving

Just built a simple To-Do List using JavaScript 🚀 This project helped me understand the basics. 🔹 Features: Add tasks Remove tasks Clear all tasks Data saved using localStorage It’s a small step, but a strong foundation towards building real-world applications 💻 #JavaScript #WebDevelopment #BeginnerProject #LearningByDoing #FrontendDevelopment

🚨 Many beginners get confused between var, let, and const in JavaScript. They all create variables… but they behave very differently. If you understand this early, your JavaScript code will be cleaner and safer. Here is the simple difference 👇 • var Old way to create variables. It is function scoped and can be re-declared and updated. • let Modern JavaScript variable. It is block scoped and can be updated but not re-declared in the same scope. • const Used for values that should not change. It is block scoped and cannot be re-assigned. Quick tip 💡 Use const by default, let when value changes, and avoid var in modern JavaScript. Small concepts like this make a big difference in writing better code. #javascript #webdevelopment #frontenddevelopment #codingtips #learnjavascript #programmingbasics #softwaredevelopment #devcommunity #100daysofcode #javascriptdeveloper

🚀 Day-22 — Revisiting JavaScript Basics Today I went back to JavaScript fundamentals and revised some important concepts. I focused on: • Throttling — limits how often a function runs Example: window.addEventListener("scroll", throttle(handleScroll, 2000)) • Debouncing — runs a function only after a delay (when user stops action) Example: input.addEventListener("input", debounce(handleSearch, 500)) • Promises — handle async operations with success/failure Example: fetch(url).then(res => res.json()).then(data => console.log(data)) • Asynchronous JavaScript — allows non-blocking execution Example: async function getData(){ const res = await fetch(url) const data = await res.json() } Revisiting these basics helped me understand them more clearly and how they actually work in real projects. Going back to fundamentals always helps. Ankur Prajapati Satwik Raj #JavaScript #WebDevelopment #LearningInPublic #BuildInPublic#21daysofcoding#sheriyans

JavaScript object shorthand: Instead of: const user = { name: name, age: age }; Write: const user = { name, age }; Less typing. Same result. Cleaner code. #JavaScript #ES6 #ProductivityTips

✨ Object Methods in JavaScript Objects are one of the most fundamental parts of JavaScript, and knowing how to work with them efficiently can make your code much more powerful and readable. In today’s post, I’ve covered important object methods in JavaScript that every developer should know. Understanding these methods helps you manipulate data structures more effectively and write cleaner, more efficient code. If you work with JavaScript regularly, mastering object methods is definitely a must. 👇 Which JavaScript object method do you use the most in your projects? Follow Muhammad Nouman for more useful content #learningoftheday #1000daysofcodingchallenge #FrontendDevelopment #WebDevelopment #JavaScript #React #Next #CodingCommunity

The Modulo Trick That Fixes a Hidden JavaScript Bug ⚠️📊 Solved LeetCode 974 today. Problem 🔍 Count subarrays whose sum is divisible by k. Initial thought 🧠 Check every subarray using prefix sums. Works, but becomes O(n²). Better approach 🚀 Use Prefix Sum + HashMap of remainders. If two prefix sums have the same remainder, their difference is divisible by k. Mental model 🧩 prefixSum % k = r If the same remainder appears again, the subarray between them is divisible by k. Important JavaScript edge case ⚠️ JS can produce negative remainders. Fix: remainder = (remainder + k) % k Interview takeaway 🎯 Divisible subarray problems → Prefix Sum + Remainder Hashing. Practical insight 💡 When using modulo in JavaScript, always normalize the remainder before storing it in a hashmap. #DSA #LeetCode #Algorithms #PrefixSum #HashMap #JavaScript #CodingInterview #InterviewPrep

🔐 Built a Password Generator using HTML, CSS, and JavaScript. This project was built while learning from Per Borgen. Features: • Custom password length • Option to include uppercase, lowercase, numbers, and symbols • One-click copy to clipboard Live Demo: https://lnkd.in/e8qq5pAH GitHub: https://lnkd.in/e6zgXnX5 Excited to keep learning and building more projects step by step 🚀 #WebDevelopment #JavaScript #LearningJourney

Day 61/100 🚀 Back to JavaScript objects — creating objects, accessing properties, using operators, and reinforcing the difference between objects and primitive data types. #100DaysOfCode #JavaScript #WebDev