Inventory

function solve(arr) {
  let heroes = [];

  class Hero {
    constructor(name, level, items) {
      this.name = name;
      this.level = level;
      this.items = items;
    }
  }

  for (let info of arr) {
    info = info.split(' / ');
    const name = info[0];
    const level = Number(info[1]);
    const items = info[2].split(', ').sort((a, b) => a.localeCompare(b));
    heroes.push(new Hero(name, level, items));
  }

  for (const hero of heroes.sort((a, b) => (a.level - b.level))) {
    console.log(`Hero: ${hero.name}\nlevel => ${hero.level}`);
    if (hero.items) { console.log(`items => ${hero.items.join(', ')}`)}
  }
}