Phone Book JS Fundamentals

function phoneBook(arr) {
    let dataBook = {};
    for (let line of arr) {
        let data = line.split(' ');
        let name = data[0];
        let number = data[1];
        dataBook[name] = number;
    }
    for (let key in dataBook) {
        console.log(`${key} -> ${dataBook[key]}`);
    }
}