Method _getLastTriggeredIndex

src/cdk/listbox/listbox.ts:1051–1054

Get the index of the last triggered option.

()

  /** Get the index of the last triggered option. */
  private _getLastTriggeredIndex() {
    const index = this.options.toArray().indexOf(this._lastTriggered!);
    return index === -1 ? null : index;
  }
}

/** Change event that is fired whenever the value of the listbox changes. */