lionsbet83

const obj = Object.fromEntries(Object
  .entries(arr
    .flatMap(Object.entries)
    .reduce((acc, n) => ((acc[n[0]] ??= new Set).add(n[1]), acc), {}))
  .map(([ k, v ]) => [ k, v.size === 1 ? [...v][0] : null ])
);

const obj = arr.reduce((acc, n) => (
  Object.keys(n).forEach(k => {
    acc[k] = Object.hasOwn(acc, k) && n[k] !== acc[k] ? null : n[k];
  }),
  acc
), {});