Iterate key/vals of Objects

obj_iterator.js

function* keyValIterator (obj) {
  for (let prop in obj) {
    yield [ prop, obj[prop] ];
  }
}

var address = {
  street: '420 Paper St.',
  city: 'Wilmington',
  state: 'Delaware'
};

for (let [ key, val ] of keyValIterator(address)) {
  console.log(key, val);
}