Validating to select in sequencial order using angular

    <input type="checkbox" (change) = "handleSelectTaskItem($event, taskItem)"

[checked]="taskItem.isCompleted" class="custom-control-input" />

   public handleSelectTaskItem(event, taskItem:any) {

        const currentIndex = this.full.task.findIndex((task) => task.id === taskItem.id);

        for (let i = 0; i < currentIndex; i++) {

          const previousTask = this.full.task[i];

          if (!previousTask.isCompleted) {

            event.currentTarget.checked = false

            return;

          }

        }

        if(taskItem.isCompleted === false)

        {

          taskItem.isCompleted = true

          event.currentTarget.checked = true

          return

        }

        else

        {

          taskItem.isCompleted = false

          event.currentTarget.checked = false

        }

    }