design a deque function in javascript

function Deque()
{
 this.stac=new Array();  
 this.popback=function(){ 
  return this.stac.pop(); 

 }

 this.pushback=function(item){
  this.stac.push(item);
 }

 this.popfront=function(){
  return this.stac.shift();
 }

 this.pushfront=function(item){
  this.stac.unshift(item);
 }
}

//push is function of Array in javascript to enter variable in last index of array.

//pop is function of Array in javascript to remove last variable from array.

//shift is use to add element in start of the array .

//unshift is use to remove element from start of the array .

function implementation {
 
var deque=new Deque();
deque.pushfront("Prashant");
deque.pushfront("Gaur");
deque.pushback("Deepak");
alert(deque.popfront());
alert(deque.popback()); 
alert(deque.popback()); 
alert(deque.popback()); 



 
}



You can design function for Queue  also only by using pop and unshift . :)




Thanks & Regards :
Prashant Gaur
+91 9030015491
91prashantgaur@gmail.com