Javascript Data Structure Stack

var stack = new Stack();
console.log(stack.isEmpty());/* w ww.  j av a2s.c o  m*/

stack.push(5);
stack.push(8);
stack.push(11);

console.log(stack.peek());
console.log(stack.size());

stack.pop();
stack.pop();
console.log(stack.size());

function Stack(){

  var items = [];

  this.push = function(element){
    items.push(element);
  };

  this.pop = function(){
    items.pop()
  };

  this.peek = function(){
    return items[items.length-1]
  };

  this.isEmpty = function(){
    return items.length == 0;
  };

  this.size = function(){
    return items.length;
  };

  this.clear = function(){
    items = [];
  };

  this.print = function(){
    console.log(items.toString());
  }

}