Address book - fundamentals

function solve(input) {
    let addressBook = {};
    for (let line of input) {

        let [name, address] = line.split(":");
        addressBook[name] = address;
    }
    let sorted = Object.entries(addressBook);
    sorted.sort((a,b) => a[0] .localeCompare(b[0]));
}
 for (let key in sorted) {
    console.log(`${key} -> ${sorted[key]}`);
}