interface ts

 https://www.geeksforgeeks.org/explain-type-assertions-in-typescript/

function fullName(person:{firstName:string,lastName:string}){

console.log(`${person.firstname} ${person.lastName}`);

}

let p={

firstName:'Bruce',

lastName?:'Wayne'//optional:registration....form

}

interface:-----

interface Person{

firstName:string,

lastName:string;

}

function fullName(person:Person){

console.log(`${person.firstName}${person.lastName}`);

}

let p={

firstname:'radhe'

}

fullName(p);

...access modifier public privat protected can be used.............