README.md in jbuilder-1.3.0 vs README.md in jbuilder-1.4.0

@@ -57,11 +57,11 @@
 
 To define attribute and structure names dynamically, use the `set!` method:
 
 ``` ruby
 json.set! :author do
-  json.set! :name, "David"
+  json.set! :name, 'David'
 end
 
 # => "author": { "name": "David" }
 ```
 
@@ -75,10 +75,20 @@
 end
 
 # => [ { "name": "David", "age": 32 }, { "name": "Jamie", "age": 31 } ]
 ```
 
+You can also extract attributes from array directly.
+
+``` ruby
+# @people = People.all
+json.array! @people, :id, :name
+
+# => [ { "id": 1, "name": "David" }, { "id": 2, "name": "Jamie" } ]
+```
+
+
 Jbuilder objects can be directly nested inside each other.  Useful for composing objects.
 
 ``` ruby
 class Person
   # ... Class Definition ... #
@@ -97,11 +107,11 @@
       company.president president.to_builder
     end
   end
 end
 
-company = Company.new("Doodle Corp", Person.new("John Stobs", 58))
+company = Company.new('Doodle Corp', Person.new('John Stobs', 58))
 company.to_builder.target!
 
 # => {"name":"Doodle Corp","president":{"name":"John Stobs","age":58}}
 ```
 
@@ -124,17 +134,31 @@
 
 # You can use partials as well. The following line will render the file
 # RAILS_ROOT/app/views/api/comments/_comments, and set a local variable
 # 'comments' with all this message's comments, which you can use inside
 # the partial.
-json.partial! "api/comments/comments", comments: @message.comments
+json.partial! 'api/comments/comments', comments: @message.comments
 ```
 
+You can explicitly make Jbuilder object return null if you want:
+
+``` ruby
+json.extract! @post, :id, :title, :content, :published_at
+json.author do
+  if @post.anonymous?
+    json.null! # or json.nil!
+  else
+    json.first_name @post.author_first_name
+    json.last_name @post.author_last_name
+  end
+end
+```
+
 Keys can be auto formatted using `key_format!`, this can be used to convert keynames from the standard ruby_format to CamelCase:
 
 ``` ruby
 json.key_format! :camelize => :lower
-json.first_name "David"
+json.first_name 'David'
 
 # => { "firstName": "David" }
 ```
 
 You can set this globaly with the class method `key_format` (from inside your environment.rb for example):