Interface Declaration

/*
  Interface
  - Interface Declaration
  --- Serve Like Types
  --- The Interface Describes The Shape Of An Object
  --- It Defines The Syntax To Follow

  --- Use With Object
  --- Use With Function
  --- Use Read Only And Optional Operator
*/

interface User {
  id?: number,
  readonly username: string,
  country: string
}

let user: User = {
  id: 100,
  username: "Elzero",
  country: "Egypt"
}

user.country = "Syria";

console.log(user);

function getData(data: User) {
  console.log(`Id Is ${data.id}`);
  console.log(`Username Is ${data.username}`);
  console.log(`Country Is ${data.country}`);
}

getData({ id: 200, username: "Osama", country: "KSA" });