reminder chain

class Reminder
{

	constructor()
	{
		this.intervalToRemind = 111;
		this.next = null;
		this.timerId = null;
	}

	next( next )
	{
		this.next = next;
		return this.next;
	}

	doSomething()
	{
		if(this.next)
		{
			this.next.run();
		}
	}

	run() 
	{
		this.timerId = setTimeout(this.doSomthing, this.intervalToRemind);
	}
}


class StretchReminder extends Reminder
{
	...
}

let first = new Reminder();

first.next(new Reminder()).next(new Reminder());

first.run();