My very first closure in javascript! I talked about being able to do this in the interview, but my understanding was mainly theoretical (although this is very similar to specializing functors in C++).

closure.js

$(function() {

  var annex = $('.page-insert-annex');
  var handle = annex.data()['handle'];

  /* get a closure around annex and handle */
  var closure = populate_annex_with_page(annex, handle);

  if (annex.length) {
    $.when($.get('/pages.json')).done(closure); // be sneaky
  }
});

function populate_annex_with_page(annex, handle) {

  return function(result) {
    var pages = result.pages;
    var page = $.grep(pages, function(page) {

      return page.handle == handle;
    })[0];

    annex.html(page.body_html);
  }
}