TypeScript-Course-2025

Constants is a variables in TypeScript and it cannot be reassigned after it has been initialized. using constants makes your code more predictable, safer and easier to debug. 1️⃣ What Are Constants in TypeScript? Constants are created using the const keyword. Why use constants? 2️⃣ How to Declare Constants in TypeScript We declare constants using … Read more

1️⃣ What Are Data Types in TypeScript? Data types define what kind of value a variable can store. In TypeScript, variables must have a type to prevent errors. ✔ Example: let name: string = “Alice”; // Only a string can be assignedlet age: number = 25; // Only a number can be assignedlet isActive: boolean … Read more

1️⃣ What Are Variables in TypeScript? A variable is a container for storing values. In TypeScript, variables must have a specific data type. ✔ Example of a variable in TypeScript: let message: string = “Hello, TypeScript!”;console.log(message); ✅ message is a variable that stores a string value. 2️⃣ Declaring Variables in TypeScript TypeScript provides three ways … Read more

1️⃣ TypeScript Syntax vs. JavaScript Syntax TypeScript extends JavaScript, meaning you can write regular JavaScript code and add extra TypeScript features. ✔ JavaScript Code (Valid in TypeScript) let message = “Hello, World!”;console.log(message); ✔ TypeScript Code with Type Annotations let message: string = “Hello, World!”;console.log(message); 👉 Key difference: The : string specifies that message must always … Read more

1️⃣ Create a New TypeScript File First, you need a TypeScript file (.ts). If you haven’t already set up TypeScript, check out our TypeScript Installation and Setup Guide. 🔹 Step 1: Create a Project Folder (If Not Done Already) If you don’t have a project folder yet, create one: mkdir my-typescript-projectcd my-typescript-project 🔹 Step 2: … Read more

1️⃣ Install Node.js and npm (Prerequisite) TypeScript runs on Node.js, so you need to install Node.js and npm (Node Package Manager) first. 🔹 Step 1: Check if Node.js is installed Open the terminal or command prompt and run: node -v If you see a version number, Node.js is already installed. If not, download and install … Read more

1️⃣ Static Typing – Avoid Common Errors One of the biggest advantages of TypeScript is static typing. Unlike JavaScript, where variables can hold any type of value, TypeScript allows you to define types. This helps in catching errors during development, not at runtime. Example: let age: number = 25; // ✅ Correctage = “twenty-five”; // … Read more