TypeScript Overview
1. Introduction to TypeScript
History of TypeScript: TypeScript was developed by Microsoft in 2012 as a statically typed superset
of JavaScript.
Characteristics of TypeScript: TypeScript provides optional static typing, classes, and interfaces to
improve the development process of large JavaScript applications.
TypeScript vs JavaScript: TypeScript is transpiled into JavaScript, which makes it fully compatible
with all JavaScript environments.
2. TypeScript Data Types
Basic Data Types: TypeScript supports basic data types like number, string, boolean, array, tuple,
enum, and any.
Type Inference: TypeScript can automatically infer types when declaring variables, but explicit type
annotations can also be used.
Union and Intersection Types: TypeScript supports union types (a variable can be one of many
types) and intersection types (a combination of multiple types).
3. Functions in TypeScript
Function Declaration: TypeScript allows for declaring functions with optional type annotations for
parameters and return values.
Optional Parameters: Functions in TypeScript can have optional parameters using the ? syntax.
Rest Parameters: TypeScript allows for handling a variable number of arguments using the rest
parameter (...args).
4. Object-Oriented Programming in TypeScript
Classes and Inheritance: TypeScript supports classes, inheritance, and access modifiers like public,
private, and protected.
Interfaces: Interfaces define contracts for objects and classes in TypeScript, specifying which
properties and methods are required.
1. Introduction to TypeScript
History of TypeScript: TypeScript was developed by Microsoft in 2012 as a statically typed superset
of JavaScript.
Characteristics of TypeScript: TypeScript provides optional static typing, classes, and interfaces to
improve the development process of large JavaScript applications.
TypeScript vs JavaScript: TypeScript is transpiled into JavaScript, which makes it fully compatible
with all JavaScript environments.
2. TypeScript Data Types
Basic Data Types: TypeScript supports basic data types like number, string, boolean, array, tuple,
enum, and any.
Type Inference: TypeScript can automatically infer types when declaring variables, but explicit type
annotations can also be used.
Union and Intersection Types: TypeScript supports union types (a variable can be one of many
types) and intersection types (a combination of multiple types).
3. Functions in TypeScript
Function Declaration: TypeScript allows for declaring functions with optional type annotations for
parameters and return values.
Optional Parameters: Functions in TypeScript can have optional parameters using the ? syntax.
Rest Parameters: TypeScript allows for handling a variable number of arguments using the rest
parameter (...args).
4. Object-Oriented Programming in TypeScript
Classes and Inheritance: TypeScript supports classes, inheritance, and access modifiers like public,
private, and protected.
Interfaces: Interfaces define contracts for objects and classes in TypeScript, specifying which
properties and methods are required.
