an example of handlebars helper for iteration

gistfile1.txt

  <table class="table table-bordered">
    {{#each_in_group this}}
      {{view App.ShowNoteView noteBinding="this"}}
    {{/each_in_group}}
  </table>

//a helper for iteration
Handlebars.registerHelper('each_in_group', function(context, options) {
  var date    = options.contexts[0], //the argument
      group   = App.notesController.get('dates_notes')[date],
      fn      = options.fn,
      buffer = "<div class='notes_list_group_date'>" + date + "</div>";

      for (var i = 0, j = group.length; i < j; i++) {
        var item = group[i];
        buffer += fn(item); //item is what "this" becomes when our code is being evaluated; fn is result of executing our code
      }
      return buffer
});

used with Ember.js