herosRegistry

function myFunc(arr) {
    const result = [];

    for (let herosData of arr) {
        let [heroName, heroLevel, heroItems] = herosData.split(" / ");
        const newHeroObj = heroFactory(heroName, Number(heroLevel), heroItems);
        result.push(newHeroObj);
    }

    function heroFactory(name, level, items) {
        const heroObj = {
            name,
            level,
            items: items ? items.split(", ") : [],
        };
        return heroObj;
    }
    return JSON.stringify(result);
}

console.log(
    myFunc([
        "Isacc / 25 ",
        "Derek / 12 / BarrelVest, DestructionSword",
        "Hes / 1 / Desolator, Sentinel, Antara",
    ])
);