getUndefinedKeys.js

function getUndefinedKeys(checkObject, keys) {
  return keys.filter(key => {
    let splitKey = key.split('.');
    let currentObj = checkObject;
    let currentIndex = 0;
    while(!isKeyUndefined(currentObj, splitKey[currentIndex]) && currentIndex < splitKey.length) {
      currentObj = currentObj[splitKey[currentIndex]];
      currentIndex++;
    }
    return currentIndex <= splitKey.length - 1;
  });
}

function isKeyUndefined(obj, key) {
  return !obj.hasOwnProperty(key) || obj[key] === undefined
}

var objToCheck = {
  a: 1,
  b: 2,
  c: {
    d: 3,
    e: false
  }
}

console.log('should be empty array:', getUndefinedKeys(objToCheck, ['a', 'b', 'c.d']));
console.log('should be empty array:', getUndefinedKeys(objToCheck, ['c']));
console.log('should be [c.f]:', getUndefinedKeys(objToCheck, ['a', 'b', 'c.f']));
console.log('should be [c.e.f]:', getUndefinedKeys(objToCheck, ['a', 'b', 'c.e.f']));
console.log('should be [e]:', getUndefinedKeys(objToCheck, ['e']));
console.log('should be empty array:', getUndefinedKeys(objToCheck, ['c.e']));