JavaScript Variables & Data Types | var, let, const | Type Conversion & Coercion | Lecture 3

Welcome to Lecture 3 of the Complete JavaScript Course – From Basics to Advanced on Technologia. In this lecture, we cover one of the most important JavaScript fundamentals: Variables and Data Types, which form the backbone of writing clean and bug-free JavaScript code. 📌 Topics covered in this video: Variables in JavaScript: var, let, and const Differences between var, let, and const (scope & behavior) Primitive vs Reference data types How JavaScript stores data in memory Type conversion vs type coercion Common mistakes beginners make with data types Understanding these concepts will help you write predictable, optimized, and professional JavaScript code, and is essential before moving to DOM, functions, and asynchronous JavaScript. 📘 Practice Questions (Covered in this Lecture): Q1. What will be the output? let a = 10; let b = a; b = 20; console.log(a); Q2. Predict the output: let obj1 = { value: 5 }; let obj2 = obj1; obj2.value = 10; console.log(obj1.value); Q3. What will be printed? console.log("5" + 2); console.log("5" - 2); Q4. Will this code throw an error? Why? const arr = [1, 2, 3]; arr.push(4); Q5. What is the output? console.log(5 == "5"); console.log(5 === "5"); Try solving these questions before watching the explanations to strengthen your understanding. 📘 JavaScript Syllabus & Resources Join our Telegram group to get: Complete JavaScript syllabus Practice questions & notes Updates for upcoming lectures 👉 Join the Telegram Group here: https://t.me/+2z0Rqn6Zl2I0YzVl 🔔 Subscribe to Technologia and enable notifications to follow the complete JavaScript series without missing any lecture. 🔥 SEO-Optimized Hashtags #JavaScript #JavaScriptVariables #JavaScriptDataTypes #VarLetConst #PrimitiveVsReference #TypeConversion #TypeCoercion #JavaScriptTutorial #JavaScriptForBeginners #LearnJavaScript #WebDevelopment #FrontendDevelopment #Programming #Coding #Technologia