const posts = [
{id: "moi", upVotes: 20},
{id: "toi", upVotes: 89},
{id: "lui", upVotes: 1},
{id: "eux", upVotes: 123},];
let [premier,second] = posts.reduce((acc, cur) => [cur, ...acc].sort((a,b) => b.upVotes - a.upVotes).slice(0,2),[]);
console.log(`Au second tour sont présents : ${premier.id} et ${second.id}`);