diff --git a/Account/AccountManager.js b/Account/AccountManager.js
index c156b4b..3cd173a 100644
--- a/Account/AccountManager.js
+++ b/Account/AccountManager.js
@@ -9,6 +9,8 @@
  */
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.Account');
     
     /**
diff --git a/Account/AccountType.enum.js b/Account/AccountType.enum.js
index 560a36c..8b0c229 100644
--- a/Account/AccountType.enum.js
+++ b/Account/AccountType.enum.js
@@ -9,6 +9,8 @@
  */
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.Account');
 
     jsOMS.Account.AccountType = Object.freeze({
diff --git a/Auth/Auth.js b/Auth/Auth.js
index 545b4bc..f1964fa 100644
--- a/Auth/Auth.js
+++ b/Auth/Auth.js
@@ -9,6 +9,8 @@
  */
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.Auth');
 
     /**
diff --git a/Chart/Chart.js b/Chart/Chart.js
index 1cbe27b..3074766 100644
--- a/Chart/Chart.js
+++ b/Chart/Chart.js
@@ -1,5 +1,7 @@
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Chart = function (id)
     {
         this.chartId = id;
@@ -226,7 +228,7 @@
                 {
                     return t[id];
                 });
-            })
+            });
         }
     };
 
diff --git a/Chart/ChartLegend.js b/Chart/ChartLegend.js
index 8e86af4..686e9e3 100644
--- a/Chart/ChartLegend.js
+++ b/Chart/ChartLegend.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+
     jsOMS.Chart.Legend = function () {
         this.position = {x: 0, y: 0};
         this.relative = true;
diff --git a/Chart/ColumnChart.js b/Chart/ColumnChart.js
index 28c986d..2c01c05 100644
--- a/Chart/ColumnChart.js
+++ b/Chart/ColumnChart.js
@@ -1,5 +1,7 @@
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Chart.ColumnChart = function (id)
     {
         this.chart = new jsOMS.Chart(id);
diff --git a/Chart/LineChart.js b/Chart/LineChart.js
index 2c575a6..321aed0 100644
--- a/Chart/LineChart.js
+++ b/Chart/LineChart.js
@@ -1,5 +1,7 @@
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Chart.LineChart = function (id)
     {
         this.chart = new jsOMS.Chart(id);
diff --git a/Chart/PieChart.js b/Chart/PieChart.js
index da51fb0..92beedf 100644
--- a/Chart/PieChart.js
+++ b/Chart/PieChart.js
@@ -1,5 +1,7 @@
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Chart.PieChart = function (id)
     {
         this.chart = new jsOMS.Chart(id);
@@ -71,7 +73,7 @@
                 .sort(null)
                 .value(function (d)
                 {
-                    return d.value
+                    return d.value;
                 });
 
         dataPoint = svg.selectAll(".dataPoint").data(this.chart.dataset, function (c)
diff --git a/Chart/TextElement.js b/Chart/TextElement.js
index 57b2767..e47a062 100644
--- a/Chart/TextElement.js
+++ b/Chart/TextElement.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+
     jsOMS.Chart.TextElement = function() {
     };
 }(window.jsOMS = window.jsOMS || {}));
diff --git a/DataStorage/CacheManager.js b/DataStorage/CacheManager.js
index 3d17ee1..062f307 100644
--- a/DataStorage/CacheManager.js
+++ b/DataStorage/CacheManager.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.DataStorage');
 
     // TODO: create comments
diff --git a/DataStorage/CookieJar.js b/DataStorage/CookieJar.js
index 7c177da..1a83e88 100644
--- a/DataStorage/CookieJar.js
+++ b/DataStorage/CookieJar.js
@@ -9,6 +9,8 @@
  */
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.DataStorage');
     
     /**
diff --git a/DataStorage/LocalStorage.js b/DataStorage/LocalStorage.js
index 3184e3c..09cb313 100644
--- a/DataStorage/LocalStorage.js
+++ b/DataStorage/LocalStorage.js
@@ -9,6 +9,8 @@
  */
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.DataStorage');
     
     /**
diff --git a/DataStorage/StorageManager.js b/DataStorage/StorageManager.js
index d2fe530..3bd1d69 100644
--- a/DataStorage/StorageManager.js
+++ b/DataStorage/StorageManager.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.DataStorage');
     
     jsOMS.DataStorage.StorageManager = function () 
diff --git a/Dispatcher/Dispatcher.js b/Dispatcher/Dispatcher.js
index bd40ad1..5d05eeb 100644
--- a/Dispatcher/Dispatcher.js
+++ b/Dispatcher/Dispatcher.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+
     jsOMS.Autoloader.defineNamespace('jsOMS.Dispatcher');
 
     jsOMS.Dispatcher.Dispatcher = function () 
diff --git a/Math/Stochastic/Forecast/LinearRegression.js b/Math/Stochastic/Forecast/LinearRegression.js
index 82d3ccc..187b862 100644
--- a/Math/Stochastic/Forecast/LinearRegression.js
+++ b/Math/Stochastic/Forecast/LinearRegression.js
@@ -24,7 +24,7 @@
 
         for (let i = 0; i < count; i++) {
             sum1 += (y[i] - meanY) * (x[i] - meanX);
-            sum2 += (x[i] - meanX) ** 2;
+            sum2 += Math.pow(x[i] - meanX, 2);
         }
 
         b1 = sum1 / sum2;
diff --git a/Message/Response/ResponseManager.js b/Message/Response/ResponseManager.js
index f181694..8e8845d 100644
--- a/Message/Response/ResponseManager.js
+++ b/Message/Response/ResponseManager.js
@@ -74,5 +74,5 @@
         } else {
             console.log('does not exist');
         }
-    }
+    };
 }(window.jsOMS = window.jsOMS || {}));
diff --git a/Models/Account.js b/Models/Account.js
index c5a913e..3eafb88 100644
--- a/Models/Account.js
+++ b/Models/Account.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+
     jsOMS.Account = function () {
         this.login = '';
         this.password = '';
diff --git a/Module/ModuleFactory.js b/Module/ModuleFactory.js
index cbbd9f1..7f48ca2 100644
--- a/Module/ModuleFactory.js
+++ b/Module/ModuleFactory.js
@@ -9,6 +9,8 @@
  */
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.Module');
     
     /**
diff --git a/Module/ModuleManager.js b/Module/ModuleManager.js
index 726ffdd..a4e37f4 100644
--- a/Module/ModuleManager.js
+++ b/Module/ModuleManager.js
@@ -9,6 +9,8 @@
  */
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.Module');
 
     /**
diff --git a/Route/Route.js b/Route/Route.js
index ac55081..2b86a2e 100644
--- a/Route/Route.js
+++ b/Route/Route.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.Route');
 
     // TODO: create comments
diff --git a/Socket/Client/Client.js b/Socket/Client/Client.js
index 2904e5b..c2be6e5 100644
--- a/Socket/Client/Client.js
+++ b/Socket/Client/Client.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+    
     jsOMS.Client = function (ip, port, protocol) {
         this.port = port;
         this.ip = ip;
@@ -30,7 +32,7 @@
             var msg = JSON.parse(event.data);
 
             self.messages[msg.type](msg);
-        }
+        };
     };
 
     jsOMS.Client.prototype.send = function(msg) {
@@ -39,5 +41,5 @@
 
     jsOMS.Client.prototype.close = function() {
         this.connection.close();
-    }
+    };
 }(window.jsOMS = window.jsOMS || {}));
diff --git a/UI/TabManager.js b/UI/TabManager.js
index 6ef36a0..c65ab99 100644
--- a/UI/TabManager.js
+++ b/UI/TabManager.js
@@ -9,6 +9,8 @@
  */
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.UI');
     
     /**
diff --git a/UI/TableManager.js b/UI/TableManager.js
index c43e824..45a3c42 100644
--- a/UI/TableManager.js
+++ b/UI/TableManager.js
@@ -9,6 +9,8 @@
  */
 (function (jsOMS)
 {
+    "use strict";
+    
     jsOMS.Autoloader.defineNamespace('jsOMS.UI');
     
     /**
diff --git a/Validation/Validation.js b/Validation/Validation.js
index 67ff9eb..838ab71 100644
--- a/Validation/Validation.js
+++ b/Validation/Validation.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+    
     jsOMS.Validation = function () {
 
     };
diff --git a/Views/TableView.js b/Views/TableView.js
index fa100c6..d13d154 100644
--- a/Views/TableView.js
+++ b/Views/TableView.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+    
     jsOMS.TableView = function () {
         this.table = null;
     };
diff --git a/Views/ViewAbstract.js b/Views/ViewAbstract.js
index c508914..0f167ee 100644
--- a/Views/ViewAbstract.js
+++ b/Views/ViewAbstract.js
@@ -1,4 +1,6 @@
 (function (jsOMS) {
+    "use strict";
+    
     jsOMS.ViewAbstract = function ()
     {
         this.element = null;