I've been able to reverse the keys and values, but I cannot find a way to return the values in a set.

Can someone give me a hint?

Here is my code

function switchDict(data) { let final = {}; for (const [k, v] of Object.entries(data)) { final[v] = []; } for (const [k, v] of Object.entries(data)) { final[v].push(k) } return final }