Method _getInvalidOptionValues

src/cdk/listbox/listbox.ts:1044–1048

* Get the sublist of values that do not represent valid option values in this listbox. * @param values The list of values * @return The sublist of values that are not valid option values

(values: readonly T[])

   * @return The sublist of values that are not valid option values
   */
  private _getInvalidOptionValues(values: readonly T[]) {
    const isEqual = this.compareWith || Object.is;
    const validValues = (this.options || []).map(option => option.value);
    return values.filter(value => !validValues.some(validValue => isEqual(value, validValue)));
  }

  /** Get the index of the last triggered option. */
  private _getLastTriggeredIndex() {