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// Constructor function that sets the values of two properties.
function Node(element){
	this.element = element;
	this.next=null;
}

// Defination for the LList constructor function 
function LList(){
	this.head = new Node("head");
	this.find = find;
	this.insert = insert;
	this.findPrevious = findPrevious;
	this.remove = remove;
	this.display = display;
}


function find(item){
	var currNode = this.head;
	while(currNode.element != item){
		currNode = currNode.next;
	}
	return currNode;
}

function insert(newElement,item){
	var newNode = new Node(newElement);
	var current = this.find(item);
	newNode.next = current.next;
	current.next = newNode;
}

function display(){
	var currNode =this.head;
	while(!(currNode.next == null)){
		console.log(currNode.next.element);
		currNode = currNode.next;
	}
}

function findPrevious(item){
	var currNode = this.head;
	while(!(currNode.next == null) && (currNode.next.element != item)){
		currNode = currNode.next;
	}
	return currNode;
}

function remove(item){
	var prevNode = this.findPrevious(item);
	if(!(prevNode.next == null)){
		prevNode.next = prevNode.next.next;
	}
}

// Main Program
var cities = new LList();
cities.insert("Conway", "head");
cities.insert("Russellville", "Conway");
cities.insert("Carlisle", "Russellville");
cities.insert("Alma", "Carlisle");
cities.display();
console.log();
cities.remove("Carlisle");
cities.display();