Duplicates an object and returns the duplicated values

duplicate.js

export function duplicate(obj) {
  if(obj === null || typeof(obj) !== 'object' || 'isActiveClone' in obj) {
    if (obj !== null && obj !== undefined)  {
      if (obj.constructor === Array) {
        return obj.slice(0);
      }
    }
    return obj;
  }
  let temp = obj.constructor(); // changed
  for(let key in obj) {
    if(Object.prototype.hasOwnProperty.call(obj, key)) {
      obj['isActiveClone'] = null;
      temp[key] = duplicate(obj[key]);
      delete obj['isActiveClone'];
    }
  }
  return temp;
}