Use a path to get a nested value in an object. eg. obj.user.address.city == path(['user', 'address', 'city'], obj)

path.js

const isObject = item => item && typeof item === 'object' && !Array.isArray(item);

const path = ([...paths], obj) => {
  const tmp = obj[paths.shift()];
  return !isObject(tmp) || !paths.length ? tmp : path(paths, tmp);
};