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1. Object.assign handle object copy and modefy

const object1 = {
  a: 1,
  b: 2,
  c: 3
};

const object2 = {
  c: 4,
};

const object3 = Object.assign({}, object1, object2);

Object.keys(object3).forEach(attr => {
  console.log(attr);
  console.log(object3[attr]);

})

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