diff --git a/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/solution.js b/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/solution.js
index 2793e32c..be728f66 100644
--- a/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/solution.js
+++ b/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/solution.js
@@ -1,6 +1,3 @@
-"use strict";
-
 function byField(fieldName){
   return (a, b) => a[field] > b[field] ? 1 : -1;
 }
-
diff --git a/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/source.js b/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/source.js
index 207f98b3..23b43383 100644
--- a/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/source.js
+++ b/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/source.js
@@ -1,7 +1,5 @@
-"use strict";
-
 function byField(fieldName){
-  
-  //Your code goes here.
+
+  // Your code goes here.
 
 }
diff --git a/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/test.js b/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/test.js
index d5378439..e3c335e0 100644
--- a/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/test.js
+++ b/1-js/06-advanced-functions/03-closure/9-sort-by-field/_js.view/test.js
@@ -1,7 +1,5 @@
-"use strict";
-
 describe("byField", function(){
-  
+
   let users = [
     { name: "John", age: 20, surname: "Johnson" },
     { name: "Pete", age: 18, surname: "Peterson" },
@@ -11,21 +9,21 @@ describe("byField", function(){
   it("sorts users by name", function(){
     let nameSortedKey = [
       { name: "Ann", age: 19, surname: "Hathaway" },
-      { name: "John", age: 20, surname: "Johnson"},    
+      { name: "John", age: 20, surname: "Johnson"},
       { name: "Pete", age: 18, surname: "Peterson" },
     ];
     let nameSortedAnswer = users.sort(byField("name"));
-    assert.equal(JSON.stringify(nameSortedKey), JSON.stringify(nameSortedAnswer));
+    assert.deepEqual(nameSortedKey, nameSortedAnswer);
   });
 
   it("sorts users by age", function(){
     let ageSortedKey = [
       { name: "Pete", age: 18, surname: "Peterson" },
       { name: "Ann", age: 19, surname: "Hathaway" },
-      { name: "John", age: 20, surname: "Johnson"}, 
+      { name: "John", age: 20, surname: "Johnson"},
     ];
     let ageSortedAnswer = users.sort(byField("age"));
-    assert.equal(JSON.stringify(ageSortedKey), JSON.stringify(ageSortedKey));
+    assert.deepEqual(ageSortedKey, ageSortedKey);
   });
 
   it("sorts users by surname", function(){
@@ -35,7 +33,7 @@ describe("byField", function(){
       { name: "Pete", age: 18, surname: "Peterson" },
     ];
     let surnameSortedAnswer = users.sort(byField("surname"));
-    assert.equal(JSON.stringify(surnameSortedAnswer), JSON.stringify(surnameSortedKey));
+    assert.deepEqual(surnameSortedAnswer, surnameSortedKey);
   });
 
 });