TypeScript中的类型

let isDone: boolean = false;

let count: number = 10;
let price: number = 3.99;

let message: string = "Hello, TypeScript!";

let numbers: number[] = [1, 2, 3, 4, 5];
let fruits: Array<string> = ["apple", "banana", "orange"];

let person: [string, number] = ["John", 25];

enum Color {
  Red,
  Green,
  Blue,
}

let color: Color = Color.Red;

let value: any = "Hello";
value = 10;
value = true;

function showMessage(): void {
  console.log("Hello");
}

let value: string | number = "Hello";
value = 10;

interface A {
  name: string;
}

interface B {
  age: number;
}

type C = A & B;

let person: C = {
  name: "John",
  age: 25,
};

type AddFunc = (a: number, b: number) => number;

let add: AddFunc = (a, b) => a + b;

type Point = {
  x: number;
  y: number;
};

let p: Point = {
  x: 10,
  y: 20,
};

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

let person: Person = {
  name: "John",
  age: 25,
};

let value: any = "Hello";
let length: number = (value as string).length;