Update code

Author: tashemi

chapters/design_patterns/observer.md

@@ -12,33 +12,36 @@ You have to notify some objects about an event happen
 Use an [Observer Pattern](http://en.wikipedia.org/wiki/Observer_pattern)
 
 {% highlight coffeescript %}
+
 class PostOffice
-  constructor: () ->
-    @subscribers = []
-  sendNewItemReleased: (item) ->
-    subscriber.callback(item) for subscriber in @subscribers when subscriber.item is item
-    return
-  subscribe: (to, onNewItemReleased) ->
-    @subscribers.push({'item':to, 'callback':onNewItemReleased})
+	constructor: () ->
+		@subscribers = []
+	notifyNewItemReleased: (item) ->
+		subscriber.callback(item) for subscriber in @subscribers when subscriber.item is item
+	subscribe: (to, onNewItemReleased) ->
+		@subscribers.push {'item':to, 'callback':onNewItemReleased}
+    
 class MagazineSubscriber
-  onNewMagazine: (item) ->
-    alert "I've got new "+item
+	onNewMagazine: (item) ->
+		alert "I've got new "+item
+
 class NewspaperSubscriber
-  onNewNewspaper: (item) ->
-    alert "I've got new "+item
+	onNewNewspaper: (item) ->
+		alert "I've got new "+item
 
 postOffice = new PostOffice()
 sub1 = new MagazineSubscriber()
 sub2 = new NewspaperSubscriber()
 postOffice.subscribe "Mens Health", sub1.onNewMagazine
 postOffice.subscribe "Times", sub2.onNewNewspaper
-postOffice.sendNewItemReleased "Times"
-postOffice.sendNewItemReleased "Mens Health"
+postOffice.notifyNewItemReleased "Times"
+postOffice.notifyNewItemReleased "Mens Health"
+
 {% endhighlight %}
 
 ## Discussion
 
 Here you have an observer object (PostOffice) and observable objects (MagazineSubscriber, NewspaperSubscriber). 
 To be notified about an event of publishing new periodical observable object should make subscribtion on PostOffice. 
-Every of subscribed objects is stored internaly in the PostOffice array of subscribers. 
+Every of subscribed objects is stored internaly in the PostOffice array of subscribtions. 
 Every subscriber is notified on new concrete periodical is published.