Vijay Shekh’s Post

Non-primitive data types Most JavaScript beginners learn numbers and strings first… But real power starts with non-primitive data types. 🚀 If you want to build real applications, you must understand these. In JavaScript, non-primitive data types can store multiple values and complex data. Here are the most important ones: • Object – Stores data in key–value pairs. Perfect for real-world data like users, products, or settings. • Array – Stores a list of values in a single variable. Great for lists like items, users, or tasks. • Function – A reusable block of code that performs a task. Functions are also treated as objects in JavaScript. • Date, Map, Set – Special objects used for managing time, unique values, and key-value collections. ✨ Key idea: Unlike primitive types, non-primitive types are stored by reference, which changes how copying and comparison work. Master these and your JavaScript skills will level up quickly. #JavaScript #WebDevelopment #FrontendDevelopment #ProgrammingBasics #LearnToCode #SoftwareDevelopment #JavaScriptTips #CodingForBeginners #FullStackDevelopment #TechEducation

📣 𝗡𝗲𝘅𝘁 𝗕𝗹𝗼𝗴 𝗶𝘀 𝗛𝗲𝗿𝗲! ⤵️ Understanding Objects in JavaScript — Finally Making Data Feel Organized 🧠📦 Storing values in separate variables works… until your program starts growing. This blog explains JavaScript objects in a simple, practical way — so beginners can understand how real applications manage structured data. 🔗 𝗥𝗲𝗮𝗱 𝗵𝗲𝗿𝗲: https://lnkd.in/gt_9TVF4 𝗧𝗼𝗽𝗶𝗰𝘀 𝗰𝗼𝘃𝗲𝗿𝗲𝗱 ✍🏻: ⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺ ⇢ Why objects are needed in real programs ⇢ Key-value pair mental model ⇢ Creating objects (literal vs constructor way) ⇢ Dot notation vs bracket notation ⇢ Updating, adding, and deleting properties ⇢ Looping through objects using for...in ⇢ Object vs array — beginner confusion cleared ⇢ Array of objects (real-world data pattern) ⇢ Common mistakes beginners make 💬 If JavaScript data still feels scattered across variables, this article helps you understand how objects bring structure, clarity, and scalability to your code. #ChaiAurCode #JavaScript #Objects #ProgrammingBasics #WebDevelopment #Beginners #LearningInPublic #100DaysOfCoding

Understanding data types is one of the most important parts of JavaScript. In simple terms: Primitive types: String, Number, Boolean, Undefined, Null  Reference types: Object, Array, Function  One interesting thing: typeof null → "object" (this is actually a known JavaScript bug) I’ve explained JavaScript data types clearly in this short video 👇   https://lnkd.in/gUf8Nz3f Which data type do you use the most in your code?

📘 𝐉𝐚𝐯𝐚𝐒𝐜𝐫𝐢𝐩𝐭 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰 𝐌𝐨𝐝𝐮𝐥𝐞 (𝐁𝐚𝐬𝐢𝐜) 𝐒𝐞𝐜𝐭𝐢𝐨𝐧 2: 𝐕𝐚𝐫𝐢𝐚𝐛𝐥𝐞𝐬 1.What is a variable? 2.Why do we use a variable? 3.How to declare a variable? 4.Tell me about variable declaration rules? 5.How many types of variables do you know? 6.When do we use var? 7.When do we use let? 8.When do we use const? 9.How to create an undefined variable?  10.What is an undefined variable? 11.What is undefined? 12.What is NaN? 13.What is null? 14.What is concatenation? 15.What is Infinity?  16.How to assign data to a variable / How to assign a variable data? 17.Variable is primitive or non-primitive? 🎯 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬 (𝐄𝐱𝐭𝐫𝐚) 1.Difference between var, let, and const? 2.What is variable hoisting? 3.Why can var be accessed before declaring it? 4.What is temporal dead zone (TDZ)? 5.Can we reassign const variable? 6.Why shouldn't modern JavaScript use var? 𝐒𝐞𝐜𝐭𝐢𝐨𝐧 3: 𝐉𝐚𝐯𝐚𝐒𝐜𝐫𝐢𝐩𝐭 𝐃𝐚𝐭𝐚 𝐓𝐲𝐩𝐞𝐬 & 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬 1.JavaScript data types? 2.What is a reserved keyword? 3.What is a special keyword? 4.How can check type data type? 5.JavaScript variables is case-sensitive? 6.JavaScript variable naming conventions? 7.How to convert string ("20") to number (20)? 8.JavaScript built-in functions? 🎯 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬 (𝐄𝐱𝐭𝐫𝐚) 1.Difference between primitive and reference types? 2.What is type coercion? 3.Difference between null and undefined? 4.What is typeof null / What is the output of typeof null and why? (Important trick question) 5.What is the difference in memory management between primitive and reference type data? #DotNet #AspNetCore #MVC #FullStack #SoftwareEngineering #ProgrammingTips #DeveloperLife #LearnToCode #JavaScript #JS #JavaScriptTips #JSLearning #FrontendDevelopment #WebDevelopment #CodingTips #CodeManagement #DevTools

Today I learned about Data Types — and honestly, it clicked! ✅ Primitive types: String, Number, Boolean, Null, Undefined, Symbol 🔁 Non-Primitive: Objects → Arrays, Functions, Objects The difference? Primitives store the VALUE directly. Non-primitives store a REFERENCE. Small concept. Big impact on how JavaScript works under the hood. 🧠 Building one day at a time. 💻 #JavaScript #WebDevelopment #LearningInPublic #CodingJourney #udemy Hitesh Choudhary

📦 Variables & Data Types Link : https://lnkd.in/gN7c82-T Most beginners jump straight into writing code without understanding how programs actually store information. So I started from the very beginning. In this chapter I cover: → What variables are (with a simple labelled-box analogy) → How to declare with var, let, and const → All 5 primitive data types — string, number, boolean, null, undefined → The key difference between var, let, and const → What scope means and why it matters Plus a 4-part assignment at the end to make everything stick. The rule I wish someone told me earlier: ✅ Default to const ✅ Switch to let only when the value needs to change ❌ Avoid var entirely in modern code If you're learning JavaScript or teaching someone who is — this is where the series starts. #JavaScript #WebDevelopment #LearnToCode #chaicode #Frontend #JSFundamentals #hiteshchoudhary #piyushgargh

🚀 Day 9| JavaScript Today I explored JavaScript Foundations: Primitive Data Types & Operations — the building blocks of programming. 📌 Key concepts I learned: 🔹 Primitive Data Types • Number & BigInt → Used for numeric values and large integers • Boolean → Represents true or false (used in decision making) • Null & Undefined → Represent empty or uninitialized values 🔹 Operations in JavaScript • Arithmetic operations (+, -, *, /) • Logical operations (&&, ||, !) • Comparison operations (==, ===, >, <) ⚙️ I also understood how JavaScript performs computational actions to process and manipulate data effectively. 💡 Learning these fundamentals is important to build strong problem-solving skills and write efficient code. Step by step, I’m strengthening my JavaScript basics and programming logic. 💻✨ #JavaScript #WebDevelopment #FrontendDevelopment #CodingJourney #LearningInPublic #DeveloperJourney #ProgrammingBasics

🚀 JavaScript Concepts Series – Day 1 👀 Let's Revise Basics 🧐 📌 JavaScript has two main categories of data types: 1️⃣ Primitive Data Types (Immutable): These store a single value and are not objects. • String • Number • Boolean • Undefined • Null • Symbol • BigInt Example: let name = "Deepak"; // String let age = 27; // Number let isDev = true; // Boolean 2️⃣ Non-Primitive (Reference) Data Types: These store collections of data or complex entities. • Object • Array • Function 👀 Example: let user_Object = { name: "Deepak", role: "Developer" }; let skills_Array = ["JavaScript", "React"]; function greet_Function() { console.log("Hello Developer"); } 💡 Key Insight: Primitive values are stored by value, while non-primitive values are stored by reference. #javascript #webdevelopment #frontenddeveloper #reactjs #coding

👽 Understanding Primitive vs Non-Primitive Data Types in JavaScript If you're learning JavaScript, one of the foundational concepts you must master is the difference between primitive and non-primitive data types. Let’s break it down clearly 🔹 Primitive Data Types These are the most basic data types in JavaScript. They store single values and are immutable (cannot be changed directly). 😵💫 Types: Number → 10, 3.14 String → "Hello" Boolean → true / false Undefined → variable declared but not assigned Null → intentional empty value BigInt → large integers Symbol → unique identifiers 💡 Key Feature: Primitive values are stored directly in memory (stack). let a = 10; let b = a; b = 20; console.log(a); // 10 (unchanged) 🔸 Non-Primitive (Reference) Data Types These are more complex and can store multiple values or collections. 🤯 Types: Object Array Function 💡 Key Feature: They are stored as references (heap memory), meaning variables point to the same memory location. let obj1 = { name: "John" }; let obj2 = obj1; obj2.name = "Doe"; console.log(obj1.name); // "Doe" (changed!) 🚀 Final Thought Understanding this difference is crucial for debugging, memory management, and writing efficient JavaScript code. Master the basics, and everything else becomes easier. #JavaScript #WebDevelopment #Programming #Coding #Frontend #Learning #Developers

Solved one of the most interesting linked list problems today: Copy List with Random Pointer. At first glance, it looks like a standard cloning problem—but the presence of a random pointer changes everything. A simple reference copy won’t work here; it requires a proper deep copy with pointer reconstruction. Key learnings: JavaScript objects are reference-based, so copying variables does not create new structures. Using a Map to store original node → cloned node simplifies pointer mapping. The problem can be broken into two clean passes: Create all nodes Reconnect next and random pointers using the map There’s also an optimized O(1) space approach using interleaving nodes. What stood out most was the importance of thinking in terms of memory structure and references, not just values. Problems like this reinforce a core principle: Understanding how data is linked is more important than just writing code that “works.” #DataStructures #LinkedList #JavaScript #ProblemSolving #SoftwareEngineering #InterviewPrep