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Entrainement à l'examen : Test 🕑minutes

const languageSkills = [
  {
    language: "Spanish",
    skill: "Professional Proficiency",
  },
  {
    language: "English",
    skill: "Professional Working Proficiency",
  },
  {
    language: "German",
    skill: "Professional Proficiency",
  },
];
const output = languageSkills.reduce((map, { language, skill }) => {
  if (map.has(skill)) map.get(skill).push(language);
  else map.set(skill, [language]);
  return map;
}, new Map());

console.log(...output);

 Que vaut output ?