Mi a gond ezzel a JavaScript-el?

var bob = {

firstName: "Bob",

lastName: "Jones",

phoneNumber: "(650) 777-7777",

email: "bob.jones@example.com"

};

var mary = {

firstName: "Mary",

lastName: "Johnson",

phoneNumber: "(650) 888-8888",

email: "mary.johnson@example.com"

};

var contacts = [bob, mary];

function printPerson(person) {

console.log(person.firstName + " " + person.lastName);

}

function list() {

var contactsLength = contacts.length;

for (var i=0; i<contactsLength; i++) {

printPerson(i);

}

}

list();