DanceMonkeyTime

function filter(val) {
  if (!(val instanceof Object)) {
    return val;
  }

  const filtered = Object
    .entries(val)
    .map(n => [ n[0], filter(n[1]) ])
    .filter(n => n[1]);

  return filtered.length
    ? val instanceof Array
      ? filtered.map(n => n[1])
      : Object.fromEntries(filtered)
    : null;
}

const isValid = arr =>
  arr.every(n => Object.values(n).every(m => !m.isRequired || m.value));

function isValid(arr) {
  for (const n of arr) {
    for (const k in n) {
      if (n.hasOwnProperty(k) && n[k].isRequired && !n[k].value) {
        return false;
      }
    }
  }

  return true;
}