Function setSelectedIndex

packages/core/src/render3/state.ts:766–777

(index: number)

 * run if and when the provided `index` value is different from the current selected index value.)
 */
export function setSelectedIndex(index: number) {
  ngDevMode &&
    index !== -1 &&
    assertGreaterThanOrEqual(index, HEADER_OFFSET, 'Index must be past HEADER_OFFSET (or -1).');
  ngDevMode &&
    assertLessThan(
      index,
      instructionState.lFrame.lView.length,
      "Can't set index passed end of LView",
    );
  instructionState.lFrame.selectedIndex = index;
}

/**
 * Gets the `tNode` that represents currently selected element.