newStackClass.js

function Stack(){
  this.top = null;
	this.length = 0;
}
Stack.prototype.push = function(n){
//the new node has to be the top so the old top should become the new node's NextNode because it should be second
		n.setNextNode(this.top);
//then you should make the new node the top
		this.top = n;
//add one to the counter;
		this.length++;
}
Stack.prototype.pop = function(){
	if(this.top != null){
		this.top = this.top.getNextNode()
		this.length--;
		return this.top;
	}
}
Stack.prototype.peek = function(){
	return this.top;
}
Stack.prototype.getLength = function(){
	return this.length;
}
Stack.prototype.isEmpty = function(){
	if(this.top == null){
		return true;
	}else{
		return false;
	}
}