Handlebar helper `or` - grabs the first *truthy* argument that you send in and outputs it. See running example at http://cdpn.io/mxBjE

handlebar_helper_or.js

// Handlebar helper
Handlebars.registerHelper('or', function () {
  var args = arguments;

  for (var i in args) {
    if (args[i]) {
      return args[i];
    }
  }
  return null;
});