js-filter-map.js

const languages = [
    { id: 1, name: 'Javascript', rating: 9 },
    { id: 1, name: 'Golang', rating: 9 },
    { id: 1, name: 'Python', rating: 8 },
    { id: 1, name: 'Rust', rating: 8 },
    { id: 1, name: 'C#', rating: 7 },
    { id: 1, name: 'Java', rating: 5 }
];

const bestLanguages = languages.filter(x => x.rating > 8).map(x => x.name);

console.log(bestLanguages);