TypeScript에서 `let` 피하기

const fruitNum: number = 0 // a number to represent a type of fruit
let fruitName: string = "Unknown"

switch(fruitNum) {
  case 0:
    fruitName = "Apple"
    break
  case 1:
    fruitName = "Banana"
    break
  default:
    break
}

const fruitNum: number = 0 // a number to represent a type of fruit
const fruitName: string = (() => {
  switch(fruitNum) {
    case 0:
      return "Apple"
    case 1:
      return "Banana"
    default:
      return "Unknown"
  }
})()