从数组中提取属性值

Question

是否有办法从数组中提取属性值?

const d = [{id: 'Cat'}, {id: 'Dog'}]
type ids = ??? //insert code here, type should be 'Cat' | 'Dog'

(如果生成const enum也可以)

Answer 1

当您用as const声明d时，您可以像这样提取信息:

const d = [{id: 'Cat'}, {id: 'Dog'}] as const
type IDs = typeof d[number]["id"]

游乐场