Notes on Typescript Enums and Interfaces

  • In TypeScript, when using an array which contains a bunch of interfaces that extend a base interface, you can use the base class as the array type and it will work.
interface Base : {
	id: number

interface Extended extends Base: {
	name: string

interface ExtendedAgain extends Base: {
	date: Moment

let item1: Base
let item2: Extended
let item3: ExtendedAgain

let items: Base[] = [
  • In TypeScript, you can access an enumerated type as an array by using Object.entries(enum)
enum Fruit : {
	Apple: "APPLE"
	Orange: "ORANGE"
	Peach: "PEACH"

Object.entries(Fruit) // ["APPLE", "ORANGE", "PEACH"]