diff --git a/guide/arabic/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md b/guide/arabic/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
index 85bd03c413..6cbdef59c0 100644
--- a/guide/arabic/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
+++ b/guide/arabic/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
@@ -12,23 +12,29 @@ localeTitle:  يتكرر عبر مفاتيح كائن مع لـ ... في بيا
 
 ### مثال 1:
 
- `for (let user in obj) { 
-    if(obj.user.online === true) { 
-      //code 
-    } 
-  } 
-` 
+```javascript
+
+for (let user in obj) {
+  if(obj.user.online === true) {
+    //code
+  }
+}
+
+```
 
 *   يوضح المثال 2 كيفية استخدام الترميز `[square-bracket]` في تنفيذ الشفرة.
 
 ### المثال 2:
 
- `for (let user in obj) { 
-    if(obj[user]online === true) { 
-      //code 
-    } 
-  } 
-` 
+```javascript
+
+for (let user in obj) {
+  if(obj[user].online === true) {
+    //code
+  }
+}
+
+```
 
 ### حل:
 
diff --git a/guide/chinese/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md b/guide/chinese/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
index 63af4e1507..473f1726d2 100644
--- a/guide/chinese/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
+++ b/guide/chinese/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
@@ -13,11 +13,11 @@ localeTitle:  使用for ... in Statement中的对象键迭代
 ### 例1：
 
 ```javascript
-for (let user in obj) { 
-    if(obj.user.online === true) { 
-      //code 
-    } 
-  } 
+for (let user in obj) {
+  if(obj.user.online === true) {
+    //code
+  }
+}
 ```
 
 *   示例2演示了如何使用`[square-bracket]`表示法执行代码。
@@ -25,11 +25,11 @@ for (let user in obj) {
 ### 例2：
 
 ```javascript
-for (let user in obj) { 
-    if(obj[user]online === true) { 
-      //code 
-    } 
-  } 
+for (let user in obj) {
+  if(obj[user].online === true) {
+    //code
+  }
+}
 ```
 
 ### 解：
diff --git a/guide/english/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md b/guide/english/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
index 4094cf1b2f..6e46d4f4f6 100644
--- a/guide/english/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
+++ b/guide/english/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
@@ -13,10 +13,10 @@ Method:
 ```javascript
 
 for (let user in obj) {
-    if(obj.user.online === true) {
-      //code
-    }
+  if(obj.user.online === true) {
+    //code
   }
+}
 
 ```
 
@@ -27,10 +27,10 @@ for (let user in obj) {
 ```javascript
 
 for (let user in obj) {
-    if(obj[user]online === true) {
-      //code
-    }
+  if(obj[user].online === true) {
+    //code
   }
+}
 
 ```
 
diff --git a/guide/portuguese/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md b/guide/portuguese/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
index 304c3717e5..8a4e6abced 100644
--- a/guide/portuguese/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
+++ b/guide/portuguese/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
@@ -13,11 +13,11 @@ Método:
 ### Exemplo 1:
 
 ```javascript
-for (let user in obj) { 
-    if(obj.user.online === true) { 
-      //code 
-    } 
-  } 
+for (let user in obj) {
+  if(obj.user.online === true) {
+    //code
+  }
+}
 ```
 
 *   O exemplo 2 demonstra como usar a notação `[square-bracket]` o código será executado.
@@ -25,11 +25,11 @@ for (let user in obj) {
 ### Exemplo 2:
 
 ```javascript
-for (let user in obj) { 
-    if(obj[user]online === true) { 
-      //code 
-    } 
-  } 
+for (let user in obj) {
+  if(obj[user].online === true) {
+    //code
+  }
+}
 ```
 
 ### Solução:
diff --git a/guide/russian/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md b/guide/russian/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
index 5c36f7858f..a7c9965ce2 100644
--- a/guide/russian/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
+++ b/guide/russian/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
@@ -13,11 +13,11 @@ localeTitle:  Итерация через ключи объекта с помо
 ### Пример 1:
 
 ```javascript
-for (let user in obj) { 
-    if(obj.user.online === true) { 
-      //code 
-    } 
-  } 
+for (let user in obj) {
+  if(obj.user.online === true) {
+    //code
+  }
+}
 ```
 
 *   В примере 2 показано, как использовать нотацию с `[square-bracket]` код будет выполнен.
@@ -25,11 +25,11 @@ for (let user in obj) {
 ### Пример 2:
 
 ```javascript
-for (let user in obj) { 
-    if(obj[user]online === true) { 
-      //code 
-    } 
-  } 
+for (let user in obj) {
+  if(obj[user].online === true) {
+    //code
+  }
+}
 ```
 
 ### Решение:
diff --git a/guide/spanish/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md b/guide/spanish/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
index ab5113c83f..0109886d4f 100644
--- a/guide/spanish/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
+++ b/guide/spanish/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md
@@ -13,11 +13,11 @@ Método:
 ### Ejemplo 1:
 
 ```javascript
-for (let user in obj) { 
-    if(obj.user.online === true) { 
-      //code 
-    } 
-  } 
+for (let user in obj) {
+  if(obj.user.online === true) {
+    //code
+  }
+}
 ```
 
 *   El ejemplo 2 demuestra cómo usar la notación `[square-bracket]` se ejecutará el código.
@@ -25,11 +25,11 @@ for (let user in obj) {
 ### Ejemplo 2:
 
 ```javascript
-for (let user in obj) { 
-    if(obj[user]online === true) { 
-      //code 
-    } 
-  } 
+for (let user in obj) {
+  if(obj[user].online === true) {
+    //code
+  }
+}
 ```
 
 ### Solución: