diff --git a/src/controllers/admin/privileges.js b/src/controllers/admin/privileges.js
index 08bfe3183a..90b50a54f7 100644
--- a/src/controllers/admin/privileges.js
+++ b/src/controllers/admin/privileges.js
@@ -9,7 +9,7 @@ var privileges = require('../../privileges');
 var privilegesController = module.exports;
 
 privilegesController.get = function (req, res, callback) {
-	var cid = req.params.cid ? req.params.cid : 0;
+	var cid = req.params.cid ? parseInt(req.params.cid, 10) : 0;
 	async.waterfall([
 		function (next) {
 			async.parallel({
@@ -38,7 +38,7 @@ privilegesController.get = function (req, res, callback) {
 		function (data) {
 			data.allCategories.forEach(function (category) {
 				if (category) {
-					category.selected = parseInt(category.cid, 10) === parseInt(cid, 10);
+					category.selected = category.cid === cid;
 				}
 			});
 
diff --git a/src/controllers/helpers.js b/src/controllers/helpers.js
index f482f98b15..71a5fdd9b0 100644
--- a/src/controllers/helpers.js
+++ b/src/controllers/helpers.js
@@ -262,9 +262,7 @@ function getCategoryData(cids, uid, selectedCid, callback) {
 			categories.getCategoriesFields(cids, ['cid', 'name', 'slug', 'icon', 'link', 'color', 'bgColor', 'parentCid', 'image', 'imageClass'], next);
 		},
 		function (categoryData, next) {
-			categoryData = categoryData.filter(function (category) {
-				return category && !category.link;
-			});
+			categoryData = categoryData.filter(category => category && !category.link);
 			var selectedCategory = [];
 			var selectedCids = [];
 			categoryData.forEach(function (category) {
@@ -272,12 +270,10 @@ function getCategoryData(cids, uid, selectedCid, callback) {
 				category.parentCid = category.hasOwnProperty('parentCid') && utils.isNumber(category.parentCid) ? category.parentCid : 0;
 				if (category.selected) {
 					selectedCategory.push(category);
-					selectedCids.push(parseInt(category.cid, 10));
+					selectedCids.push(category.cid);
 				}
 			});
-			selectedCids.sort(function (a, b) {
-				return a - b;
-			});
+			selectedCids.sort((a, b) => a - b);
 
 			if (selectedCategory.length > 1) {
 				selectedCategory = {
diff --git a/src/events.js b/src/events.js
index 17c20f6cd1..9d727e8451 100644
--- a/src/events.js
+++ b/src/events.js
@@ -86,10 +86,7 @@ events.getEvents = function (filter, start, stop, callback) {
 			db.getSortedSetRevRange('events:time' + (filter ? ':' + filter : ''), start, stop, next);
 		},
 		function (eids, next) {
-			var keys = eids.map(function (eid) {
-				return 'event:' + eid;
-			});
-			db.getObjects(keys, next);
+			db.getObjects(eids.map(eid => 'event:' + eid), next);
 		},
 		function (eventsData, next) {
 			eventsData = eventsData.filter(Boolean);
diff --git a/src/topics/fork.js b/src/topics/fork.js
index 5ea1ca1f87..7de56cd789 100644
--- a/src/topics/fork.js
+++ b/src/topics/fork.js
@@ -79,6 +79,7 @@ module.exports = function (Topics) {
 
 	Topics.movePostToTopic = function (callerUid, pid, tid, callback) {
 		var postData;
+		tid = parseInt(tid, 10);
 		async.waterfall([
 			function (next) {
 				Topics.exists(tid, next);
@@ -94,7 +95,7 @@ module.exports = function (Topics) {
 					return next(new Error('[[error:no-post]]'));
 				}
 
-				if (parseInt(post.tid, 10) === parseInt(tid, 10)) {
+				if (post.tid === tid) {
 					return next(new Error('[[error:cant-move-to-same-topic]]'));
 				}
 
@@ -143,10 +144,10 @@ module.exports = function (Topics) {
 					return callback();
 				}
 				var tasks = [];
-				if (parseInt(topicData[0].pinned, 10) !== 1) {
+				if (!topicData[0].pinned) {
 					tasks.push(async.apply(db.sortedSetIncrBy, 'cid:' + topicData[0].cid + ':tids:posts', -1, postData.tid));
 				}
-				if (parseInt(topicData[1].pinned, 10) !== 1) {
+				if (!topicData[1].pinned) {
 					tasks.push(async.apply(db.sortedSetIncrBy, 'cid:' + topicData[1].cid + ':tids:posts', 1, toTid));
 				} else {
 					next();
@@ -156,7 +157,7 @@ module.exports = function (Topics) {
 				});
 			},
 			function (next) {
-				if (parseInt(topicData[0].cid, 10) === parseInt(topicData[1].cid, 10)) {
+				if (topicData[0].cid === topicData[1].cid) {
 					return callback();
 				}
 
diff --git a/src/topics/posts.js b/src/topics/posts.js
index de62b79450..aca0cc3516 100644
--- a/src/topics/posts.js
+++ b/src/topics/posts.js
@@ -202,8 +202,8 @@ module.exports = function (Topics) {
 				Topics.getLatestUndeletedReply(tid, next);
 			},
 			function (pid, next) {
-				if (parseInt(pid, 10)) {
-					return callback(null, pid.toString());
+				if (pid) {
+					return callback(null, pid);
 				}
 				Topics.getTopicField(tid, 'mainPid', next);
 			},
@@ -211,7 +211,7 @@ module.exports = function (Topics) {
 				posts.getPostFields(mainPid, ['pid', 'deleted'], next);
 			},
 			function (mainPost, next) {
-				next(null, parseInt(mainPost.pid, 10) && parseInt(mainPost.deleted, 10) !== 1 ? mainPost.pid.toString() : null);
+				next(null, mainPost.pid && !mainPost.deleted ? mainPost.pid : null);
 			},
 		], callback);
 	};
@@ -251,7 +251,7 @@ module.exports = function (Topics) {
 				return isDeleted && !done;
 			},
 			function (err) {
-				callback(err, latestPid);
+				callback(err, parseInt(latestPid, 10));
 			}
 		);
 	};
diff --git a/src/topics/recent.js b/src/topics/recent.js
index 433a25b1b6..8b62e788a7 100644
--- a/src/topics/recent.js
+++ b/src/topics/recent.js
@@ -59,13 +59,13 @@ module.exports = function (Topics) {
 				Topics.getLatestUndeletedPid(tid, next);
 			},
 			function (pid, next) {
-				if (!parseInt(pid, 10)) {
+				if (!pid) {
 					return callback();
 				}
 				posts.getPostField(pid, 'timestamp', next);
 			},
 			function (timestamp, next) {
-				if (!parseInt(timestamp, 10)) {
+				if (!timestamp) {
 					return callback();
 				}
 				Topics.updateLastPostTime(tid, timestamp, next);
diff --git a/src/topics/suggested.js b/src/topics/suggested.js
index bb450a759d..29f651346d 100644
--- a/src/topics/suggested.js
+++ b/src/topics/suggested.js
@@ -10,6 +10,7 @@ var search = require('../search');
 module.exports = function (Topics) {
 	Topics.getSuggestedTopics = function (tid, uid, start, stop, callback) {
 		var tids;
+		tid = parseInt(tid, 10);
 		async.waterfall([
 			function (next) {
 				async.parallel({
@@ -23,9 +24,7 @@ module.exports = function (Topics) {
 			},
 			function (results, next) {
 				tids = results.tagTids.concat(results.searchTids);
-				tids = tids.filter(function (_tid) {
-					return parseInt(_tid, 10) !== parseInt(tid, 10);
-				});
+				tids = tids.filter(_tid => _tid !== tid);
 				tids = _.shuffle(_.uniq(tids));
 
 				if (stop !== -1 && tids.length < stop - start + 1) {
@@ -78,9 +77,7 @@ module.exports = function (Topics) {
 				}, next);
 			},
 			function (data, next) {
-				var tids = data.posts.map(function (post) {
-					return post && parseInt(post.tid, 10);
-				});
+				var tids = data.posts.map(post => post && post.tid);
 				next(null, tids);
 			},
 		], callback);
@@ -96,10 +93,8 @@ module.exports = function (Topics) {
 			},
 			function (data, next) {
 				var tids = data.topics.filter(function (topic) {
-					return topic && !topic.deleted && parseInt(tid, 10) !== parseInt(topic.tid, 10);
-				}).map(function (topic) {
-					return topic && parseInt(topic.tid, 10);
-				});
+					return topic && !topic.deleted && tid !== topic.tid;
+				}).map(topic => topic && topic.tid);
 				next(null, tids);
 			},
 		], callback);
diff --git a/src/topics/tools.js b/src/topics/tools.js
index b28b8d12d4..ae727602c8 100644
--- a/src/topics/tools.js
+++ b/src/topics/tools.js
@@ -212,9 +212,7 @@ module.exports = function (Topics) {
 				Topics.getTopicsFields(tids, ['cid'], next);
 			},
 			function (topicData, next) {
-				var uniqueCids = _.uniq(topicData.map(function (topicData) {
-					return topicData && parseInt(topicData.cid, 10);
-				}));
+				var uniqueCids = _.uniq(topicData.map(topicData => topicData && topicData.cid));
 
 				if (uniqueCids.length > 1 || !uniqueCids.length || !uniqueCids[0]) {
 					return next(new Error('[[error:invalid-data]]'));
diff --git a/test/topics.js b/test/topics.js
index 06153cf192..a108415c40 100644
--- a/test/topics.js
+++ b/test/topics.js
@@ -685,7 +685,7 @@ describe('Topic\'s', function () {
 					var topic;
 					var i;
 					for (i = 0; i < topics.length; i += 1) {
-						if (parseInt(topics[i].tid, 10) === parseInt(newTid, 10)) {
+						if (topics[i].tid === parseInt(newTid, 10)) {
 							assert.equal(false, topics[i].unread, 'ignored topic was marked as unread in recent list');
 							return done();
 						}
@@ -1384,7 +1384,7 @@ describe('Topic\'s', function () {
 					topics.getUnreadTids({ cid: 0, uid: adminUid }, next);
 				},
 				function (unreadTids, next) {
-					assert(!unreadTids.includes(parseInt(topic.tid, 10)));
+					assert(!unreadTids.includes(topic.tid));
 					User.blocks.remove(blockedUid, adminUid, next);
 				},
 			], done);