Merge branch 'en' of https://github.com/iliakan/javascript-tutorial into en

1-js/01-getting-started/2-code-editors/article.md

@@ -20,7 +20,7 @@ If you haven't considered selecting an IDE, look at the following variants:
 - [Komodo IDE](http://www.activestate.com/komodo-ide) and it's lightweight free version [Komodo Edit](http://www.activestate.com/komodo-edit).
 - [Netbeans](http://netbeans.org/).
 
-All of them with the exception of Visual Studio are cross-platform.
+All of them with the exception of Visual Studio are cross-platform. Visual Studio is now available for Mac and for Windows (https://www.visualstudio.com/vs/visual-studio-mac/)
 
 Most IDEs are paid, but have a trial period. Their cost is usually negligible compared to a qualified developer's salary, so just choose the best one for you.
 

1-js/03-code-quality/06-polyfills/article.md

@@ -9,13 +9,13 @@ So it's quite common for an engine to implement only the part of the standard.
 
 A good page to see the current state of support for language features is <https://kangax.github.io/compat-table/es6/> (it's big, we have a lot to study yet).
 
-## Babel.JS
+## Babel
 
 When we use modern features of the language, some engines may fail to support such code. Just as said, not all features are implemented everywhere.
 
-Here Babel.JS comes to the rescue.
+Here Babel comes to the rescue.
 
-[Babel.JS](https://babeljs.io) is a [transpiler](https://en.wikipedia.org/wiki/Source-to-source_compiler). It rewrites modern JavaScript code into the previous standard.
+[Babel](https://babeljs.io) is a [transpiler](https://en.wikipedia.org/wiki/Source-to-source_compiler). It rewrites modern JavaScript code into the previous standard.
 
 Actually, there are two parts in Babel:
 
@@ -33,7 +33,7 @@ Actually, there are two parts in Babel:
 
 So, we need to setup the transpiler and add the polyfill for old engines to support modern features.
 
-If we orient towards modern engines and do not use features except those supported everywhere, then we don't need to use Babel.JS.
+If we orient towards modern engines and do not use features except those supported everywhere, then we don't need to use Babel.
 
 ## Examples in the tutorial
 

1-js/07-object-oriented-programming/05-native-prototypes/article.md

@@ -156,7 +156,7 @@ function showArgs() {
 */!*
 }
 
-showList("John", "Pete", "Alice"); // John - Pete - Alice
+showArgs("John", "Pete", "Alice"); // John - Pete - Alice
 ```
 
 Because `join` resides in `Array.prototype`, we can call it from there directly and rewrite it as:

1-js/07-object-oriented-programming/08-class-patterns/article.md

@@ -47,7 +47,7 @@ function User(name, birthday) {
 *!*
   // only visible from other methods inside User
   function calcAge() {
-    new Date().getFullYear() - birthday.getFullYear();
+    return new Date().getFullYear() - birthday.getFullYear();
   }
 */!*
 
@@ -76,7 +76,7 @@ Like this:
 function User(name, birthday) {
   // only visible from other methods inside User
   function calcAge() {
-    new Date().getFullYear() - birthday.getFullYear();
+    return new Date().getFullYear() - birthday.getFullYear();
   }
 
   return {

1-js/07-object-oriented-programming/09-class/article.md

@@ -294,7 +294,7 @@ class Article {
 */!*
 }
 
-let article = article.createTodays();
+let article = Article.createTodays();
 
 alert( articles.title ); // Todays digest
 ```

1-js/07-object-oriented-programming/10-class-inheritance/article.md

@@ -125,7 +125,7 @@ class Rabbit extends Animal {
 *!*
   stop() {
     super.stop(); // call parent stop
-    hide(); // and then hide
+    this.hide(); // and then hide
   }
 */!*
 }