Introduction

This documentation provides a thorough understanding of TypeScript for developers of all levels, from beginners to advanced users. The goal is to explain each concept with code examples and relatable real-life analogies to make learning intuitive and engaging. Let's discover in depth.

What is TypeScript?

TypeScript is a superset of JavaScript that adds static typing and other features to enhance code quality and developer productivity. It compiles to plain JavaScript, which runs in any browser or Node.js environment.

Why Use TypeScript?

• Error Detection: Catches errors during development (instant-while writing on IDEs).
• Enhanced Tooling: Offers autocompletion, type checking, and documentation (like ours).
• Scalability: Ideal for large projects.

Benefits over JavaScript

1. Fewer Bugs: TypeScript catches common errors (like types or incorrect data types) during development.

let age: number = 25;
age = "twenty-five"; // Error: Type 'string' is not assignable to type 'number'

Meanwhile in JavaScript:

let age = 25;
age = "twenty-five"; // No issues. 'string' can be assignable to type 'number'
console.log(age); // twenty-five

2. Better Code Readability: Explicit types make your code self-documenting and easier to understand.
3. Improved Productivity: With features like autocompletion, inline hints, and refactoring tools, you write code faster and more confidently.
4. Easier Collaboration: Static types make it easier for teams to work on large codebases, as everyone knows what types to expect.
5. Modern JavaScript Features: TypeScript supports the latest JavaScript features and adds its own, like interfaces, decorators, and more.
6. Scalability: TypeScript makes it easier to manage large and complex projects, thanks to its strong typing system and better tooling support.

JavaScript VS TypeSCript

Key Differences Between TypeScript and JavaScript

Feature	JavaScript	TypeScript
Typing	Dynamic typing (types checked at runtime)	Static typing (types checked at compile time)
Error Checking	Errors only show up during execution	Errors caught during development
IDE Support	Basic code suggestions	Advanced autocompletion, inline documentation, and type inference
Compilation	Directly runs in browsers	Needs to be compiled into JavaScript using the TypeScript compiler (tsc)
New Features	Limited to what browsers support	Supports future JavaScript features + TypeScript-only features
Interfaces & Types	Not supported natively	Fully supports interfaces, custom types, and more
Learning Curve	Easier for beginners	Slightly steeper learning curve, but more predictable code