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/**
 * STACK
 * 
 */
function Stack() {
  this._top = null;
}

Stack.prototype = {
  push: function(data) {
    var node = {
      data: data,
      next: null
    };

    if(this._top) {
      node.next = this._top;
    }

    this._top = node;

    return this;
  },

  pop: function() {
    var top   = this._top,
        data  = top.data || null;

    this._top = top.next || null;

    return data;
  },

  toString: function() {
    var node = this._top,
        temp = [];

    while(node) {
      temp.push(node.data);
      node = node.next;
    }

    if(temp.length) {
      return temp.join(', ');
    }
  }
};