typescript

type Person = {

　　name : string

　　birthday : Date | null

}

const p:Person = {name:"Tom", birthday:null}

 

type FT  =  (id:number)==>string

const ft : FT = (id:number)==>id.toString

 

class A{

　　readonly 

}

 

type alias

type Secret = "secret"

type Person = {

　　name : string

　　birthday : Date | Secret

}

type Person_ = [string, Date]

const p:Person = {name:"Tom", birthday:new Date()}

const p1:Person_ = ["Tom", new Date()]

const [name, birthday] = p1