diff --git a/1-js/04-object-basics/06-constructor-new/article.md b/1-js/04-object-basics/06-constructor-new/article.md
index 66adf400..0680a876 100644
--- a/1-js/04-object-basics/06-constructor-new/article.md
+++ b/1-js/04-object-basics/06-constructor-new/article.md
@@ -162,9 +162,6 @@ function SmallUser() {
   this.name = "John";
 
   return; // finishes the execution, returns this
-
-  // ...
-
 }
 
 alert( new SmallUser().name );  // John
diff --git a/1-js/05-data-types/05-array-methods/6-calculator-extendable/_js.view/solution.js b/1-js/05-data-types/05-array-methods/6-calculator-extendable/_js.view/solution.js
index 50c40e80..45ef1619 100644
--- a/1-js/05-data-types/05-array-methods/6-calculator-extendable/_js.view/solution.js
+++ b/1-js/05-data-types/05-array-methods/6-calculator-extendable/_js.view/solution.js
@@ -1,6 +1,6 @@
 function Calculator() {
 
-  let methods = {
+  this.methods = {
     "-": (a, b) => a - b,
     "+": (a, b) => a + b
   };
@@ -12,14 +12,14 @@ function Calculator() {
       op = split[1],
       b = +split[2]
 
-    if (!methods[op] || isNaN(a) || isNaN(b)) {
+    if (!this.methods[op] || isNaN(a) || isNaN(b)) {
       return NaN;
     }
 
-    return methods[op](a, b);
+    return this.methods[op](a, b);
   }
 
   this.addMethod = function(name, func) {
-    methods[name] = func;
+    this.methods[name] = func;
   };
 }
diff --git a/1-js/05-data-types/05-array-methods/6-calculator-extendable/solution.md b/1-js/05-data-types/05-array-methods/6-calculator-extendable/solution.md
index 41178663..982d3f9e 100644
--- a/1-js/05-data-types/05-array-methods/6-calculator-extendable/solution.md
+++ b/1-js/05-data-types/05-array-methods/6-calculator-extendable/solution.md
@@ -1,3 +1,5 @@
 
-- Please note how methods are stored. They are simply added to the internal object.
+- Please note how methods are stored. They are simply added to `this.methods` property.
 - All tests and numeric conversions are done in the `calculate` method. In future it may be extended to support more complex expressions.
+
+[js src="_js/solution.js"]
diff --git a/1-js/05-data-types/05-array-methods/6-calculator-extendable/task.md b/1-js/05-data-types/05-array-methods/6-calculator-extendable/task.md
index cc5453ce..e0d302f4 100644
--- a/1-js/05-data-types/05-array-methods/6-calculator-extendable/task.md
+++ b/1-js/05-data-types/05-array-methods/6-calculator-extendable/task.md
@@ -31,6 +31,6 @@ The task consists of two parts.
     alert( result ); // 8
     ```
 
-- No brackets or complex expressions in this task.
+- No parentheses or complex expressions in this task.
 - The numbers and the operator are delimited with exactly one space.
 - There may be error handling if you'd like to add it.