Method removeAt

packages/forms/src/model/form_array.ts:234–243

* Remove the control at the given `index` in the array. * * @param index Index in the array to remove the control. If `index` is negative, wraps around * from the back. If `index` is greatly negative (less than `-length`), removes the first * element. This behavior is the same a

(index: number, options: {emitEvent?: boolean} = {})

   * NOTE: Removing the FormArray will not mark it dirty. If you want to mark if dirty, call `markAsDirty()`.
   */
  removeAt(index: number, options: {emitEvent?: boolean} = {}): void {
    // Adjust the index, then clamp it at no less than 0 to prevent undesired underflows.
    let adjustedIndex = this._adjustIndex(index);
    if (adjustedIndex < 0) adjustedIndex = 0;

    if (this.controls[adjustedIndex])
      this.controls[adjustedIndex]._registerOnCollectionChange(() => {});
    this.controls.splice(adjustedIndex, 1);
    this.updateValueAndValidity({emitEvent: options.emitEvent});
  }

  /**
   * Replace an existing control.