default Meteor project using template session

gistfile1.js

if (Meteor.isClient) {
  Template.hello.created = function() {
    this.setDefault('counter', 0);
  };

  Template.hello.helpers({
    counter: function() {
      var template = Template.instance();
      return template.get('counter');
    }
  });

  Template.hello.events({
    'click button': function(event, template) {
      // increment the counter when button is clicked
      template.set('counter', template.get('counter') + 1);
    }
  });
}

if (Meteor.isServer) {
  Meteor.startup(function () {
    // code to run on server at startup
  });
}