Static Typing
Typescript allows you to specify types for variables, parameters, return types and more. This helps type-related errors during development.
let age: number = 30;
let name: string = "foo";
let isDev: boolean = true;
function add(x:number, y:number):number{return x+y}Interfaces
Interfaces define the structure of objects
interface Person {
name: string;
age: number;
}
function greet(person: Person): void {
console.log(`Hello, ${person.name}!`);
}
let user = { name: "foo", age: 25 };
greet(user);Classes and inheritance
Typescript supports classes and inheritance
class Fruit{
//properties
name:string;
color:string;
// constructor
constructor(name:string, color:string){
this.name = name;
this.color = color;
}
// Method
describe():string{
return `This ${this.name} is ${this.color}`;
}
}
// subClass
class Appple extends Fruit{
//additional property
taste: string;
// constructor
constructor(name:string, color:string, taste: string){
super(name, color);
this.taste = taste;
}
// Override method
describe():string{
return `${super.describe()} It tastes ${this.taste}.`;
}
}
// create instance
const apple = new Apple("Apple", "red", "sweet");