typescript

  1. Exclude<T, U>，T有，U没有
type ResT = Exclude<"a"|"b"|"c", "c"|"d">
// ResT = "a"|"b"
  1. Extract<T, U>，T、U交集
type ResT = Extract<"a"|"b"|"c", "c"|"d">
// ResT = "c"
  1. Pick<T, K>，从T中取出K
ExampleTyle = {
  lable: string
  id: string
}
const ResT = Pick<ExampleTyle, 'lable'>
// ResT = {label: string}
  1. Omit<T, K>，从T中去除K
ExampleTyle = {
  id: string
  lable: string
  name: string
}
const ResT = Omit<ExampleTyle, 'lable'>
// ResT = {
//   id: string
//   name: string
// }