Method at

packages/forms/src/model/form_array.ts:168–170

* Get the `AbstractControl` at the given `index` in the array. * * @param index Index in the array to retrieve the control. If `index` is negative, it will wrap * around from the back, and if index is greatly negative (less than `-length`), the result is * undefined. This behavior is

(index: number)

   * undefined. This behavior is the same as `Array.at(index)`.
   */
  at(index: number): ɵTypedOrUntyped<TControl, TControl, AbstractControl<any>> {
    return (this.controls as any)[this._adjustIndex(index)];
  }

  /**
   * Insert a new `AbstractControl` at the end of the array.