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+Sometimes the ruby-style `sort_by` sorting is easier to use than JavaScripts default `sort` implementation.
+
+Here's a plugin that brings `sort_by` functionality to jQuery.
+
+    $.fn.sortBy = function(fn, options) {
+      var opts = $.extend({ reverse: false }, options);
+      return this.map(function(i, el) { return [[fn(el, i), el]]; }).sort(function(a, b) {
+        return (a[0] == b[0] ? 0 : (a[0] > b[0] ? 1 : -1)) * (opts.reverse ? -1 : 1);
+      }).map(function(i, ar) { return ar[1]; });
+    };
+
+And here's how you use it.
+
+    $trs.sortBy(function(tr) {
+      return $(tr).find('.' + col).data('sort');
+    }, { reverse: $th.is('.desc') }).appendTo($tbody);