old_contents: //http://stackoverflow.com/questions/728360/most-elegant-way-to-clone-a-javascript-object#answer-728694
  export default function clone(obj) {
    var copy;
  
    // Handle the 3 simple types, and null or undefined
    if (null == obj || "object" != typeof obj) return obj;
  
    // Handle Date
    if (obj instanceof Date) {
      copy = new Date();
      copy.setTime(obj.getTime());
      return copy;
    }
  
    // Handle Array
    if (obj instanceof Array) {
      copy = [];
      for (var i = 0, len = obj.length; i < len; i++) {
        copy[i] = clone(obj[i]);
      }
      return copy;
    }
  
    // Handle Object
    if (obj instanceof Object) {
      copy = {};
      for (var attr in obj) {
        if (obj.hasOwnProperty(attr)) copy[attr] = clone(obj[attr]);
      }
      return copy;
    }
  
    throw new Error("Unable to copy obj! Its type isn't supported.");
  }
new_contents: //http://stackoverflow.com/questions/728360/most-elegant-way-to-clone-a-javascript-object#answer-728694
  export default function clone(obj) {
  
    // Handle the 3 simple types, and null or undefined
    if (null == obj || "object" != typeof obj) return obj;
  
    // Handle Date
    if (obj instanceof Date) {
      let copy = new Date();
      copy.setTime(obj.getTime());
      return copy;
    }
  
    // Handle Array
    if (obj instanceof Array) {
      return obj.map(e => clone(e));
    }
  
    // Handle Object
    if (obj instanceof Object) {
      let copy = {};
      for (var attr in obj) {
        if (obj.hasOwnProperty(attr)) copy[attr] = clone(obj[attr]);
      }
      return copy;
    }
  
    throw new Error("Unable to copy obj! Its type isn't supported.");
  }
subject: Simplify clone function