app.ts

//Working with "optional chaining"                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

type Customer = {
  birthday: Date
};

function getCustomer(id: number): Customer | null | undefined {
  return id === 0 ? null : { birthday: new Date() };
}

let customer = getCustomer(1);
//Optional property access operator
console.log(customer?.birthday.getFullYear());

//optional element access operator
//customer?.[0]

//optional call
let  log: any = null;
log?.('a');

console.log(log);