typescript 型について

typescriptの型まとめ

// primitive
const apple: number = 5
const speed: string = 'fast'
const hasName: boolean = true

const nothingMuch: null = null
const nothing: undefined = undefined
const now: Date = new Date()

// array
const colors: string[] = ['red', 'green', 'blue']
const myNumbers: number[] = [1, 2, 3]
const truths: boolean[] = [true, false, true]

// class
class Car {}

const car: Car = new Car()

// object literal
const point: { x: number, y: number } = {
  x: 10,
  y: 20
}

const destinations = {
  Japan: {
    longitude: 153,
    latitude: 24
  },
  America: {
    longitude: 38,
    latitude: 97
  }
}
const { Japan }: { Japan: { longitude: number; latitude: number } } = destinations


//any
const every: any[] = [10, 'Jon', true, null, undefined]

// tuple
type Drink = [string, boolean, number]

const pepsi: Drink = ['brown', true, 40]
const sprite: Drink = ['clear', true, 40]
const tea: Drink = ['brown', false, 0]

// interface
interface Person {
  name: string,
  age:number,
  gender: boolean
}

const candidate = (person: Person) => {
  console.log(person.name)
  console.log(person.age)
  console.log(person.gender)
}