//FormControl setValue
  setValue(value: any, options: {
    onlySelf?: boolean, // When true, each change only affects this control, and not its parent.
    emitEvent?: boolean, // When true or not supplied (the default),
    emitModelToViewChange?: boolean, //  When true or not supplied  (the default), each change triggers an `onChange` event
    emitViewToModelChange?: boolean // When true or not supplied (the default), each change triggers an `ngModelChange` event
  } = {}): void {
    // Update the value
    (this as{value: any}).value = this._pendingValue = value;

    // Notify others of the change if we are allowed to emit events
    if (this._onChange.length && options.emitModelToViewChange !== false) {

      // Loop through each of our onChange subscriber functions and call them to notify them of an update
      this._onChange.forEach(
          (changeFn) => changeFn(this.value, options.emitViewToModelChange !== false));
    }
    // update the form value and check it's validity, calling other validators if req.
    this.updateValueAndValidity(options);
  }

    /**
   * Patches the value of a control.
   * This function is functionally the same as setValue at this level.
   * It exists for symmetry with patchValue on `FormGroups` and `FormArrays`, where it does behave differently.
   */
  patchValue(value: any, options: {
    onlySelf?: boolean,
    emitEvent?: boolean,
    emitModelToViewChange?: boolean,
    emitViewToModelChange?: boolean
  } = {}): void {
    this.setValue(value, options);
  }