code: function extend(o) {
    if (typeOf(o) !== 'object') { return {}; }
    var args = arguments;
    var len = args.length - 1;
  
    for (var i = 0; i < len; i++) {
      var obj = args[i + 1];
  
      if (typeOf(obj) === 'object' && typeOf(obj) !== 'regexp') {
        for (var key in obj) {
          if (obj.hasOwnProperty(key)) {
            o[key] = obj[key];
          }
        }
      }
    }
    return o;
  }
docs: Extend `o` with properties of other `objects`.
  
  @param  {Object} `o` The target object. Pass an empty object to shallow clone.
  @param  {Object} `objects`
  @return {Object}