diff --git a/static/js/pandora.js b/static/js/pandora.js
index 0e1f57117..000c09aeb 100644
--- a/static/js/pandora.js
+++ b/static/js/pandora.js
@@ -177,7 +177,7 @@ appPanel
         var prefix = '/static/';
         if (localStorage && localStorage['pandora.debug']) {
             Ox.getJSON(prefix + 'json/pandora.json?' + Ox.random(1000), function(files) {
-                Ox.loadFiles(Ox.map(files, function(file) {
+                Ox.loadFiles(files.map(function(file) {
                     return prefix + file;
                 }), callback);
             });
@@ -227,13 +227,13 @@ appPanel
             }) ? 'manual' : data.site.layers.some(function(layer) {
                 return layer.hasEvents;
             }) ? 'auto' : 'none',
-            clipKeys: Ox.map(data.site.clipKeys, function(key) {
+            clipKeys: data.site.clipKeys.map(function(key) {
                 return Ox.extend(key, {
                     operator: pandora.getSortOperator(key.id)
                 });
             }),
-            findKeys: Ox.map(data.site.itemKeys, function(key) {
-                return key.find ? key : null;
+            findKeys: data.site.itemKeys.filter(function(key) {
+                return key.find;
             }),
             itemsSection: pandora.site.itemName.plural.toLowerCase(),
             map: data.site.layers.some(function(layer) {
@@ -259,14 +259,16 @@ appPanel
                     {id: 'featured', title: 'Featured Texts', showBrowser: false}
                 ]
             },
-            sortKeys: Ox.map(pandora.site.itemKeys, function(key) {
-                return key.sort ? Ox.extend(key, {
+            sortKeys: pandora.site.itemKeys.filter(function(key) {
+                return key.sort;
+            }).map(function(key) {
+                return Ox.extend(key, {
                     operator: pandora.getSortOperator(key.id)
-                }) : null;
+                });
             })
         });
         pandora.site.listSettings = {};
-        Ox.map(pandora.site.user.ui, function(val, key) {
+        Ox.forEach(pandora.site.user.ui, function(val, key) {
             if (/^list[A-Z]/.test(key)) {
                 pandora.site.listSettings[key] = key[4].toLowerCase() + key.substr(5);
             }
diff --git a/static/js/pandora/URL.js b/static/js/pandora/URL.js
index 137339239..39e7898dd 100644
--- a/static/js/pandora/URL.js
+++ b/static/js/pandora/URL.js
@@ -176,18 +176,22 @@ pandora.URL = (function() {
             list: Ox.merge(
                 // listView is the default view
                 [pandora.user.ui.listView],
-                Ox.map(pandora.site.listViews, function(view) {
-                    return view.id == pandora.user.ui.listView ? null : view.id;
+                pandora.site.listViews.filter(function(view) {
+                    return view.id == pandora.user.ui.listView
+                }).map(function(view) {
+                    return view.id;
                 })
             ),
             item: Ox.merge(
                 // itemView is the default view,
                 // videoView is the default view if there is a duration
                 [pandora.user.ui.itemView, pandora.user.ui.videoView],
-                Ox.map(pandora.site.itemViews, function(view) {
+                pandora.site.itemViews.filter(function(view) {
                     return [
                         pandora.user.ui.itemView, pandora.user.ui.videoView
-                    ].indexOf(view.id) > -1 ? null : view.id;
+                    ].indexOf(view.id) > -1;
+                }).map(function(view) {
+                     return view.id;
                 })
             )
         };
@@ -200,11 +204,11 @@ pandora.URL = (function() {
                     || pandora.isClipView(view)
                         && Ox.getObjectById(pandora.site.clipKeys, pandora.user.ui.listSort[0].key)
                     || [],
-                pandora.isClipView(view) ? Ox.map(pandora.site.clipKeys, function(key) {
-                    return key.id == pandora.user.ui.listSort[0].key ? null : key;
+                pandora.isClipView(view) ? pandora.site.clipKeys.filter(function(key) {
+                    return key.id == pandora.user.ui.listSort[0].key;
                 }) : [],
-                Ox.map(pandora.site.sortKeys, function(key) {
-                    return key.id == pandora.user.ui.listSort[0].key ? null : key;
+                pandora.site.sortKeys.filter(function(key) {
+                    return key.id == pandora.user.ui.listSort[0].key;
                 })
             );
         });
@@ -213,8 +217,8 @@ pandora.URL = (function() {
                 sortKeys[itemsSection].item[view] = Ox.merge(
                     // itemSort[0].key is the default sort key
                     [Ox.getObjectById(pandora.site.clipKeys, pandora.user.ui.itemSort[0].key)],
-                    Ox.map(pandora.site.clipKeys, function(key) {
-                        return key.id == pandora.user.ui.itemSort[0].key ? null : key;
+                    pandora.site.clipKeys.filter(function(key) {
+                        return key.id == pandora.user.ui.itemSort[0].key;
                     })
                 );
             }
diff --git a/static/js/pandora/filesView.js b/static/js/pandora/filesView.js
index 7abff02f5..10d1af9cd 100644
--- a/static/js/pandora/filesView.js
+++ b/static/js/pandora/filesView.js
@@ -311,9 +311,9 @@ pandora.ui.filesView = function(options, self) {
                     }, function(result) {
                     */
                     conditions = {};
-                    Ox.map(['id', 'title', 'director', 'year'], function(key) {
+                    ['id', 'title', 'director', 'year'].map(function(key) {
                         var value = self['$' + key + 'Input'].value();
-                        if(value.length) {
+                        if (value.length) {
                             conditions[key] = key == 'director' ? value.split(', ') : value;
                         }
                     });
diff --git a/static/js/pandora/filterForm.js b/static/js/pandora/filterForm.js
index 086d8f403..3b7fd3853 100644
--- a/static/js/pandora/filterForm.js
+++ b/static/js/pandora/filterForm.js
@@ -15,7 +15,7 @@ pandora.ui.filterForm = function(list) {
     }, function(result) {
         that.append(
             that.$filter = Ox.Filter({
-                findKeys: Ox.merge(Ox.map(pandora.site.itemKeys, function(itemKey) {
+                findKeys: Ox.merge(pandora.site.itemKeys.map(function(itemKey) {
                     var key = Ox.clone(itemKey);
                     key.type = key.type == 'layer'
                         ? Ox.getObjectById(pandora.site.layers, key.id).type
diff --git a/static/js/pandora/findElement.js b/static/js/pandora/findElement.js
index 6fe5d0c74..a902d221d 100644
--- a/static/js/pandora/findElement.js
+++ b/static/js/pandora/findElement.js
@@ -28,13 +28,14 @@ pandora.ui.findElement = function() {
                     pandora.$ui.findSelect = Ox.Select({
                             id: 'select',
                             items: Ox.merge(
-                                Ox.map(pandora.site.findKeys, function(key, i) {
+                                pandora.site.findKeys.filter(function(key, i) {
                                     return !key.capability
-                                        || pandora.site.capabilities[key.capability][pandora.user.level]
-                                    ? {
+                                        || pandora.site.capabilities[key.capability][pandora.user.level];
+                                }).map(function(key) {
+                                    return {
                                         id: key.id,
                                         title: 'Find: ' + key.title,
-                                    } : null;
+                                    };
                                 }),
                                 [{}, {
                                     id: 'advanced',
diff --git a/static/js/pandora/infoView.0xdb.js b/static/js/pandora/infoView.0xdb.js
index 842947728..e6c2b8d3d 100644
--- a/static/js/pandora/infoView.0xdb.js
+++ b/static/js/pandora/infoView.0xdb.js
@@ -643,9 +643,9 @@ pandora.ui.infoView = function(data) {
                 Ox.Button({
                         tooltip: (canEdit ? Ox.toTitleCase(userLevel) : 'You') + ' '
                             + (hasCapability ? 'can' : 'can\'t') + ' '
-                            + Ox.map(Ox.toSlashes(capability.name).split('/'), function(word, i) {
-                                return i == 0 ? null : word.toLowerCase();
-                            }).join(' ')
+                            + Ox.toSlashes(capability.name)
+                                .split('/').slice(1).join(' ')
+                                .toLowerCase()
                                 .replace('see item', 'see the item')
                                 .replace('play video', 'play the full video')
                                 .replace('download video', 'download the video'),
diff --git a/static/js/pandora/infoView.js b/static/js/pandora/infoView.js
index c4a543805..9024ccec2 100644
--- a/static/js/pandora/infoView.js
+++ b/static/js/pandora/infoView.js
@@ -616,9 +616,9 @@ pandora.ui.infoView = function(data) {
                 Ox.Button({
                         tooltip: (canEdit ? Ox.toTitleCase(userLevel) : 'You') + ' '
                             + (hasCapability ? 'can' : 'can\'t') + ' '
-                            + Ox.map(Ox.toSlashes(capability.name).split('/'), function(word, i) {
-                                return i == 0 ? null : word.toLowerCase();
-                            }).join(' '),
+                            + Ox.toSlashes(capability.name)
+                                .split('/').slice(1).join(' ')
+                                .toLowerCase(),
                         title: capability.symbol,
                         type: 'image'
                     })
diff --git a/static/js/pandora/infoView.padma.js b/static/js/pandora/infoView.padma.js
index c4a543805..9024ccec2 100644
--- a/static/js/pandora/infoView.padma.js
+++ b/static/js/pandora/infoView.padma.js
@@ -616,9 +616,9 @@ pandora.ui.infoView = function(data) {
                 Ox.Button({
                         tooltip: (canEdit ? Ox.toTitleCase(userLevel) : 'You') + ' '
                             + (hasCapability ? 'can' : 'can\'t') + ' '
-                            + Ox.map(Ox.toSlashes(capability.name).split('/'), function(word, i) {
-                                return i == 0 ? null : word.toLowerCase();
-                            }).join(' '),
+                            + Ox.toSlashes(capability.name)
+                                .split('/').slice(1).join(' ')
+                                .toLowerCase(),
                         title: capability.symbol,
                         type: 'image'
                     })
diff --git a/static/js/pandora/list.js b/static/js/pandora/list.js
index 02654881b..2aeb9f5d8 100644
--- a/static/js/pandora/list.js
+++ b/static/js/pandora/list.js
@@ -52,27 +52,27 @@ pandora.ui.list = function() {
                 titleImage: pandora.user.ui.icons == 'posters' ? 'SetPoster' : 'Icon',
                 visible: pandora.user.ui.listColumns.indexOf('posterRatio') > -1,
                 width: 16
-            }], Ox.map(pandora.site.sortKeys, function(key) {
-                var position = pandora.user.ui.listColumns.indexOf(key.id);
+            }], pandora.site.sortKeys.filter(function(key) {
                 return !key.capability
-                    || pandora.site.capabilities[key.capability][pandora.user.level]
-                    ? {
-                        align: ['string', 'text'].indexOf(
-                            Ox.isArray(key.type) ? key.type[0]: key.type
-                        ) > -1 ? 'left' : key.type == 'list' ? 'center' : 'right',
-                        defaultWidth: key.columnWidth,
-                        format: key.format,
-                        id: key.id,
-                        operator: pandora.getSortOperator(key.id),
-                        position: position,
-                        removable: !key.columnRequired,
-                        title: key.title,
-                        type: key.type,
-                        unique: key.id == 'id',
-                        visible: position > -1,
-                        width: pandora.user.ui.listColumnWidth[key.id] || key.columnWidth
-                    }
-                    : null;
+                    || pandora.site.capabilities[key.capability][pandora.user.level];
+            }).map(function(key) {
+                var position = pandora.user.ui.listColumns.indexOf(key.id);
+                return {
+                    align: ['string', 'text'].indexOf(
+                        Ox.isArray(key.type) ? key.type[0]: key.type
+                    ) > -1 ? 'left' : key.type == 'list' ? 'center' : 'right',
+                    defaultWidth: key.columnWidth,
+                    format: key.format,
+                    id: key.id,
+                    operator: pandora.getSortOperator(key.id),
+                    position: position,
+                    removable: !key.columnRequired,
+                    title: key.title,
+                    type: key.type,
+                    unique: key.id == 'id',
+                    visible: position > -1,
+                    width: pandora.user.ui.listColumnWidth[key.id] || key.columnWidth
+                };
             })),
             columnsMovable: true,
             columnsRemovable: true,
diff --git a/static/js/pandora/menu.js b/static/js/pandora/menu.js
index 1603dcd3c..de8bca6e1 100644
--- a/static/js/pandora/menu.js
+++ b/static/js/pandora/menu.js
@@ -602,13 +602,15 @@ pandora.ui.mainMenu = function() {
             { id: 'sortitems', title: 'Sort ' + (isClipView || ui.item ? 'Clips' : pandora.site.itemName.plural) + ' by', items: [
                 { group: 'listsort', min: 1, max: 1, items: Ox.merge(
                     items,
-                    Ox.map(pandora.site.sortKeys, function(key) {
+                    pandora.site.sortKeys.filter(function(key) {
                         return Ox.getIndexById(items, key.id) == -1 && (
                             !key.capability
                             || pandora.site.capabilities[key.capability][pandora.user.level]
-                        ) ? Ox.extend({
+                        );
+                    }).map(function(key) {
+                        return Ox.extend({
                             checked: ui.listSort[0].key == key.id
-                        }, key) : null;
+                        }, key);
                     })
                 ) }
             ] },
diff --git a/static/js/pandora/sortSelect.js b/static/js/pandora/sortSelect.js
index e3e30dffa..6ad056cc3 100644
--- a/static/js/pandora/sortSelect.js
+++ b/static/js/pandora/sortSelect.js
@@ -15,13 +15,14 @@ pandora.ui.sortSelect = function(isNavigationView) {
     if (!pandora.user.ui.item) {
         items = Ox.merge(
             items,
-            Ox.map(pandora.site.sortKeys, function(key) {
+            pandora.site.sortKeys.filter(function(key) {
                 return Ox.getIndexById(items, key.id) == -1 && (
                     !key.capability
-                    || pandora.site.capabilities[key.capability][pandora.user.level]
-                ) ? Ox.extend(Ox.clone(key), {
+                    || pandora.site.capabilities[key.capability][pandora.user.level];
+            }).map(function(key) {
+                return Ox.extend(Ox.clone(key), {
                     title: 'Sort by ' + key.title
-                }) : null;
+                });
             })
         );
     }
diff --git a/static/js/pandora/statisticsDialog.js b/static/js/pandora/statisticsDialog.js
index 835878fa8..2b1e4bb3a 100644
--- a/static/js/pandora/statisticsDialog.js
+++ b/static/js/pandora/statisticsDialog.js
@@ -353,13 +353,14 @@ pandora.ui.statisticsDialog = function() {
                                                     element: '<img>',
                                                     tooltip: mode == 'all' && (key == 'continent' || key == 'region')
                                                         ? Ox.wordwrap(
-                                                            Ox.map(Ox.COUNTRIES, function(country) {
+                                                            Ox.COUNTRIES.filter(function(country) {
                                                                 return country[key] == split[key == 'continent' ? 0 : 1]
                                                                     && country.code.length == 2
-                                                                    && ['AC', 'CP', 'DG', 'EA', 'EU', 'IC', 'TA', 'UK'].indexOf(country.code) == -1
+                                                                    && !country.exception
                                                                     && !country.disputed
-                                                                    && !country.dissolved
-                                                                    ? country.name : null;
+                                                                    && !country.dissolved;
+                                                            }).map(function(country) {
+                                                                return country.name;
                                                             }).sort().join(', '),
                                                             64, '<br>', true
                                                         ).split(', ').map(function(country) {
diff --git a/static/js/pandora/usersDialog.js b/static/js/pandora/usersDialog.js
index aa4745edb..907c79e13 100644
--- a/static/js/pandora/usersDialog.js
+++ b/static/js/pandora/usersDialog.js
@@ -659,11 +659,11 @@ pandora.ui.usersDialog = function() {
                     }),
                 Ox.Select({
                     id: 'level',
-                    items: Ox.map(pandora.site.userLevels, function(level, i) {
-                        return i ? {
+                    items: pandora.site.userLevels.slice(1).map(function(level) {
+                        return {
                             id: level,
                             title: Ox.toTitleCase(level)
-                        } : null;
+                        };
                     }),
                     label: 'Level',
                     labelWidth: 80,
diff --git a/static/js/pandora/utils.js b/static/js/pandora/utils.js
index 2de2ae603..30564dbe6 100644
--- a/static/js/pandora/utils.js
+++ b/static/js/pandora/utils.js
@@ -596,13 +596,13 @@ pandora.getItemByIdOrTitle = function(str, callback) {
             }, function(result) {
                 var id = '';
                 if (result.data.items.length) {
-                    var items = Ox.map(result.data.items, function(item) {
+                    var items = Ox.filter(Ox.map(result.data.items, function(item) {
                         // test if exact match or word match
                         var sort = new RegExp('^' + str + '$', 'i').test(item.title) ? 2000000
                             : new RegExp('\\b' + str + '\\b', 'i').test(item.title) ? 1000000 : 0;
                         return sort ? {id: item.id, sort: sort + (parseInt(item[sortKey]) || 0)} : null;
                         // fixme: remove the (...|| 0) check once the backend sends correct data
-                    });
+                    }));
                     if (items.length) {
                         id = items.sort(function(a, b) {
                             return b.sort - a.sort;
@@ -1170,12 +1170,12 @@ pandora.unloadWindow = function() {
         // If exactly one condition has the given key and operator
         // (including or excluding conditions where all subconditions match)
         // returns the corresponding index, otherwise returns -1
-        var indices = Ox.map(conditions, function(condition, i) {
+        var indices = Ox.indicesOf(conditions, function(condition) {
             return (
                 condition.conditions
                 ? includeSubconditions && everyCondition(condition.conditions, key, operator)
                 : condition.key == key && condition.operator == operator
-            ) ? i : null;
+            );
         });
         return indices.length == 1 ? indices[0] : -1;
     }
@@ -1245,9 +1245,9 @@ pandora.unloadWindow = function() {
                     return filter.index > -1;
                 }).length;
             // indices of non-advanced find queries
-            indices = Ox.map(pandora.site.findKeys, function(findKey) {
+            indices = Ox.indicesOf(pandora.site.findKeys, function(findKey) {
                 var index = oneCondition(find.conditions, findKey.id, '=');
-                return index > -1 ? index : null;
+                return index > -1;
             });
             state = conditions == 1 && indices.length == 1 ? {
                 index: indices[0],
diff --git a/static/js/pandora/videoPreview.js b/static/js/pandora/videoPreview.js
index 0fdb8141d..771874b86 100644
--- a/static/js/pandora/videoPreview.js
+++ b/static/js/pandora/videoPreview.js
@@ -6,7 +6,7 @@ pandora.ui.videoPreview = function(data) {
     var that = Ox.VideoPreview({
             duration: data.duration,
             getFrame: function(position) {
-                var resolutions = Ox.filter(pandora.site.video.resolutions, function(resolution, i) {
+                var resolutions = pandora.site.video.resolutions.filter(function(resolution, i) {
                         return resolution >= data.height;
                     }),
                     resolution = resolutions.length
diff --git a/static/js/pandora/viewSelect.js b/static/js/pandora/viewSelect.js
index fdc01df29..b211eefa1 100644
--- a/static/js/pandora/viewSelect.js
+++ b/static/js/pandora/viewSelect.js
@@ -6,10 +6,10 @@ pandora.ui.viewSelect = function() {
     var ui = pandora.user.ui,
         sortKey = !ui.item ? 'listSort' : 'itemSort',
         viewKey = !ui.item ? 'listView' : 'itemView',
-        items = Ox.map(pandora.site[viewKey + 's'], function(view) {
-            return ['data', 'files'].indexOf(view.id) == -1
-                ? {id: view.id, title: 'View ' + view.title}
-                : null;
+        items = pandora.site[viewKey + 's'].filter(function(view) {
+            return ['data', 'files'].indexOf(view.id) == -1;
+        }).map(function(view) {
+            return {id: view.id, title: 'View ' + view.title};
         }),
         that;
     if (