code: function Handler(onFulfilled, onRejected, promise){                                                                 // 186
    this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;                                        // 187
    this.onRejected = typeof onRejected === 'function' ? onRejected : null;                                           // 188
    this.promise = promise;                                                                                           // 189
  }
docs: 184 185