Method _isValidIndex

src/material/chips/chip-set.ts:177–179

* Utility to ensure all indexes are valid. * * @param index The index to be checked. * @returns True if the index is valid for our list of chips.

(index: number)

   * @returns True if the index is valid for our list of chips.
   */
  protected _isValidIndex(index: number): boolean {
    return index >= 0 && index < this._chips.length;
  }

  /**
   * Removes the `tabindex` from the chip set and resets it back afterwards, allowing the