03. Hero Recruitment js exam

function solve(args) {
  let commandLine = args.shift();
  const heroes = {};
  while (commandLine !== 'End') {
    const [commmand, heroName, spellName] = commandLine.split(' ');

    switch (commmand) {
      case 'Enroll':


        if (Object.prototype.hasOwnProperty.call(heroes, heroName)) {
          console.log(`${heroName} is already enrolled.`);
        } else {
          heroes[heroName] = heroName;
          heroes[heroName] = [];
        }

        break;
      case 'Learn':
        if (Object.prototype.hasOwnProperty.call(heroes, heroName)) {
          const spellIsFind = heroes[heroName].some((spell) => spell === spellName);
          if (spellIsFind) {
            console.log(`${heroName} has already learnt ${spellName}.`);
          } else {
            heroes[heroName].push(spellName);
          }
        } else {
          console.log(`${heroName} doesn't exist.`);
        }
        break;
      case 'Unlearn':
        if (Object.prototype.hasOwnProperty.call(heroes, heroName)) {
          const spellIsFind = heroes[heroName].some((spell) => spell === spellName);
          if (spellIsFind) {
            const takeIndex = heroes[heroName].indexOf(spellName);
            heroes[heroName] = heroes[heroName].splice(takeIndex, 0);
          } else {
            console.log(`${heroName} doesn't know ${spellName}.`);
          }
        } else {
          console.log(`${heroName} doesn't exist.`);
        }
        break;

      default:
        break;
    }


    commandLine = args.shift();
  }


  console.log('Heroes:');
  const sortedHeroes = Object.entries(heroes).sort((a, b) => b[1].length - a[1].length || a[0].localeCompare(b[0]));

  sortedHeroes.forEach((el) => {
    const [heroName, spellbook] = el;

    if (heroes[heroName]) {
      const spells = spellbook.join(', ');
      console.log(`== ${heroName}: ${spells}`);
    }
  });
}