best way to object oriented javascript code example

Example 1: js oop

var salva = createNewPerson('Salva');
salva.name;
salva.greeting();

Example 2: js oop

let names = {
    fname: "Dillion",
    lname: "Megida"
}
console.log(names.fname);
console.log(names.hasOwnProperty("mname"));
// Expected Output
// Dillion
// false