Switching values of the same properties in two different objects

objects.js

// i still feel like there is a better way to do this, but this is what i came up with. If you know a better way please share
const oldObject = { name: 'John Doe', nationality: 'South Africa' };
const newObject = { name: 'John Doe Seth' };

function changeDataInObjects(newData, oldData) {
  for (let i in oldData) {
    for (let j in newData) {
      if (i === j) { // i and j represents the property names of oldData and newData respectively
        oldData[i] = newData[j];
      } else {
        oldData[j] = newData[j];
      }
    }
  }
  return oldData;
}

changeDataInObjects(newObject, oldObject)