Use JSPM for frontend JS modules

static/js/filter.js

@@ -0,0 +1,19 @@
+export default {
+
+  /**
+   * Returns only the incidents which fall into the given categories
+   * @param  {Array[Object]} data The incidents to filter
+   * @param  {Array[String]} categories
+   * @return {Arreay[Obect]}
+   */
+  categories: function (data, categories) {
+    return response.filter(function (incident) {
+      for (var i = 0, l = incident.categories.length; i < l; i++)
+        if (categories.indexOf(incident.categories[i]) !== -1)
+          return true;
+
+      return false;
+    });
+  }
+
+}