JS function which takes a new 'object' and the 'currentObj' and returns an object telling you which values have changed on from the currentObj to the object

getDiff.js

function getDiff (object, currentObj)) {
  let diff = {};
  for (let key in object) {
    if (!object.hasOwnProperty(key)) continue;
    if (typeof object[key] === 'object' && object[key] && typeof currentObj[key] === 'object' && currentObj[key]) {
      diff[key] = this.getDiff(object[key], currentObj[key]);
    } else if (object[key] !== currentObj[key]) {
      diff[key] = object[key];
    }
  }

  for (let key in currentObj) {
    if (!currentObj.hasOwnProperty(key)) continue;
    if (currentObj[key] && object[key] === undefined) {
      diff[key] = undefined;
    }
  }

  return diff;
};

export default getDiff;