0x04 Interfaces

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2024-07-21 16:37

一、Introduction #

Interfaces in TypeScript provide a way to define a contract for a type, which includes a set of properties, methods, and events. It’s used to enforce a structure for an object, class, or function argument.

interface User {
  name: string;
  age: number;
}

const user: User = {
  name: 'John Doe',
  age: 30,
};

Types are used to create a new named type based on an existing type or to combine existing types into a new type. Interfaces, on the other hand, are used to describe the structure of objects and classes.

In TypeScript, you can extend an interface by creating a new interface that inherits from the original interface using the “extends” keyword.

interface Shape {
  width: number;
  height: number;
}

interface Square extends Shape {
  sideLength: number;
}

let square: Square = {
  width: 10,
  height: 10,
  sideLength: 10,
};

一、Introduction #

Reference #