Method trackBy

src/cdk/table/table.ts:495–497

()

   */
  @Input()
  get trackBy(): TrackByFunction<T> {
    return this._trackByFn;
  }
  set trackBy(fn: TrackByFunction<T>) {
    if ((typeof ngDevMode === 'undefined' || ngDevMode) && fn != null && typeof fn !== 'function') {
      console.warn(`trackBy must be a function, but received ${JSON.stringify(fn)}.`);