🤞Here's hoping the optional chaining operator lands

getFn.js

function get(obj, ...props) {
  const val = obj[props[0]];

  if (props.length === 1 || !val) return val;

  const rest = props.slice(1);

  return get.apply(null, [val, ...rest]);
}

const user = {
  name: {
    first: 'joss',
    last: 'mack'
  }
}

console.log(get(user, 'name', 'first')) // 'joss'
console.log(get(user, 'address', 'street1')) // undefined (YAY!)
console.log(user.address.street1) // Error (Boo!)