Heroic Inventory JS Advanced

function heroicInventory(arr) {
    let register = [];
    for (let line of arr) {
        let tokens = line.split(' / ');
        let name = tokens[0];
        let level = Number(tokens[1]);
        let items = tokens[2];
        items = items ? tokens[2].split(', ') : [];

        register.push({ name, level, items });
    }
    console.log(JSON.stringify(register));
}