We don't need to use reduce if it's not necessary

no-need-to-reduce.js

const ids = [100, 101, 102, 103];

// We can use reduce to wrap ids in an object
const first = ids.reduce((out, id) => {
    out.push({ id });
    return out;
}, []);

// Or use map to do the same
const second = ids.map((id) => {
  return { id: id };
});

// And it could be a one-liner
const third = ids.map((id) => ({ id }));

console.log(first);
console.log(second);
console.log(third);