Learning JavaScript Data Types: Strings, Numbers, Booleans & More

Day 13 of Learning JavaScript 💻 Today I practiced accessing and modifying object properties. Example: user.name = "New Name" This is useful when working with dynamic data. Feels good to understand how real apps update data. #javascript #frontenddeveloper

Today I finally understood how JavaScript actually stores data in memory — and it changed the way I look at code. Earlier, I used to just write variables and functions without thinking much about what’s happening behind the scenes. But now it makes a lot more sense: Primitive values (like numbers, strings, booleans) are stored directly in memory Reference types (like arrays and objects) are stored differently — the variable holds a reference, not the actual value That’s why things like this behave unexpectedly sometimes: Copying objects doesn’t create a real copy Changing one reference can affect another Understanding this cleared up a lot of confusion I had while debugging. Still learning, but this felt like a small breakthrough Hitesh Choudhary Piyush Garg Chai Code #JavaScript #WebDevelopment #100DaysOfCode #LearningInPublic

Day 12 of Learning JavaScript 🚀 Today I explored objects in more depth. Objects help represent real-world data. Example: A user, a product, a profile — everything can be modeled using objects. This is where JavaScript starts to feel practical. #javascript #frontenddeveloper

Today I started Chapter 8 – Events in JavaScript. Before this chapter, I have already studied: • Chapter 1 – Introduction to JavaScript • Chapter 2 – Variables • Chapter 3 – Data Types • Chapter 4 – Operators • Chapter 5 – Conditional Statements • Chapter 6 – Loops • Chapter 7 – DOM Manipulation

🚀 JavaScript Learning Update Today I covered some JavaScript fundamentals: • "console.log()" – used to print messages in the console • Variables – containers used to store data • null vs undefined • Dynamic typing in JavaScript • Variable rules and naming conventions • Difference between var, let, and const • 7 Primitive Data Types in JavaScript • Comments in JavaScript • Arithmetic & Unary Operators Building a strong foundation step by step. 💻 #JavaScript #WebDevelopment #CodingJourney #Learning

Javascript: typeof operator ⚡ JavaScript has a tiny operator that reveals BIG truths. It’s called typeof. If you’re new to JavaScript, this operator helps you understand what type of data you’re working with. That’s extremely helpful when debugging or writing safer code. Here’s why developers love using typeof: • It tells you the data type of a variable • It helps debug unexpected values • It works with numbers, strings, booleans, objects, functions, and more • It prevents logic errors in conditions Example: typeof "Hello" // "string" typeof 42 // "number" typeof true // "boolean" typeof undefined // "undefined" typeof {} // "object" 💡 Simple rule: When you're unsure about a value → use typeof. Small operator. Huge debugging power. #JavaScript #WebDevelopment #FrontendDevelopment #LearnToCode #ProgrammingBasics #JavaScriptTips #CodingForBeginners #SoftwareDevelopment #DeveloperCommunity #TechLearning

Worth reading today. Maps and Sets in JavaScript: A Beginner-Friendly Guide JavaScript provides many ways to store and manage data. While Arrays and Objects are widely used, Maps and Sets are two powerful yet often overlooked data structures. Full blog → https://lnkd.in/dwk3yBJn #TechEducation #LearningJourney #Developers #Coding

Most beginners start JavaScript… but don’t understand variables & data types deeply. They declare variables. Store values. Write basic code. It feels easy — until logic gets complex. Then the real problems start: Confusion in data handling. Unexpected bugs. Weak logic building. Difficulty scaling code. In 2026, JavaScript isn’t about syntax. It’s about building strong logic foundations. This is where it starts: • Understanding var, let, const clearly • Knowing different data types (string, number, boolean, object, array) • Storing and managing data efficiently • Writing clean and predictable logic • Avoiding common beginner mistakes Because strong logic doesn’t come from frameworks — it comes from mastering the basics. Curious — are your fundamentals strong or just “working somehow”? #JavaScript #WebDevelopment #Coding #Programming #FrontendDevelopment #LearnToCode #DeveloperLife #JSBasics

🚀 Day 8 of My JavaScript Learning Journey Today I learned about Strings in JavaScript and explored various built-in methods to manipulate text. 📌 What I learned: • A String is a sequence of characters used to store text data • Strings are immutable (cannot be changed directly) • It is a primitive data type • String operations always return a new string ⚙️ String methods I practiced: ✔ length ✔ toUpperCase() / toLowerCase() ✔ trim() ✔ slice() / substring() ✔ replace() ✔ includes() ✔ indexOf() ✔ split() ✔ concat() 💡 I also practiced template literals: Hello ${name} → makes string formatting easier and cleaner. Understanding strings is very important because text handling is used in almost every application. Step by step, I’m improving my JavaScript fundamentals and coding skills. 💻✨ #JavaScript #WebDevelopment #FrontendDevelopment #CodingJourney #LearningInPublic #DeveloperJourney #ProgrammingBasics

🚀 JavaScript Day 2 – Deep Understanding of Core Concepts Today I focused on understanding each concept in detail with definitions and clarity 💻🔥 📌 Topics & Definitions: 🌐 Origin of JavaScript JavaScript was created in 1995 by Brendan Eich to make web pages interactive. 📝 Variables Declaration Variables are used to store data values using let, var, or const. 🔒 Constants Declaration Constants (const) store values that cannot be reassigned after declaration. ⚠️ Old Method: var var is the old way of declaring variables, function-scoped and can cause issues. ❌ Problems with var No block scope Can be redeclared Causes bugs due to hoisting 🔑 let vs const let → value can change const → value cannot change 📊 Data Types in JavaScript 👉 Primitive Data Types (Immutable) Number 🔢 → Stores numeric values String 🧵 → Stores text Boolean ✅❌ → true/false values Undefined ❓ → Variable declared but not assigned Null ⚪ → Intentional empty value BigInt 💡 → Large integers beyond Number limit Symbol 🔐 → Unique identifier 👉 Non-Primitive Data Types (Mutable) Array 📦 → Collection of values Object 🧱 → Key-value pairs Function ⚙️ → Reusable block of code 🧠 Important Concepts: 🔍 Null vs Undefined undefined → value not assigned null → intentionally empty ⚙️ typeof Operator Used to check data type of a value 🤯 typeof null Bug typeof null returns "object" (this is a known JavaScript bug) 🔒 Immutability (Primitive) Primitive values cannot be changed directly 🔄 Mutability (Non-Primitive) Objects & arrays can be modified 📥 Pass by Value Primitive values are copied when assigned 🔗 Pass by Reference Objects are assigned by reference (memory address) 💡 Why Pass by Reference? To save memory and improve performance 📅 Day 2 Complete ✔️ Building strong fundamentals step by step 💪 #JavaScript #LearningJourney #Day2 #Coding #WebDevelopment #Programming #Developer