const clone = Object.assign({}, original);

  const object = {x: 'a', y: 'b', z: 'c'}
  for (const key in object) {
    console.log(`${key}: ${object[key]}`);
  }

x: a
y: b
z: c

TypeError: page[Symbol.iterator] is not a function. (In 'page[Symbol.iterator]()', 'page[Symbol.iterator]' is undefined)

Uncaught TypeError: page[Symbol.iterator] is not a function