Fix #152: Document option object pattern

doc/calling-javascript.md

@@ -176,6 +176,29 @@ or as
 js.Dynamic.literal("foo" -> 42, "bar" -> "foobar")
 {% endhighlight %}
 
+### Literal object construction using an Scala object interface
+Sometimes for a nicer interface, literal objects can be implimented using 
+a trait interface. 
+The above JavaScript code can be implemented using following code:
+
+{% highlight scala %}
+trait MyObject extends js.Object {
+ val foo: Int = js.native
+ val bar: String = js.native
+}
+{% endhighlight %}
+
+A Scala object should be added for typesafe creation, it would help the readability 
+of the code by removing lots of `js.Dynamic.literal` all over the code. 
+
+{% highlight scala %}
+object MyObject{
+ def apply(foo: Int, bar: String): MyObject = {
+ js.Dynamic.literal(foo = foo, bar = bar).asInstanceOf[MyObject]
+ }
+}
+{% endhighlight %}
+
 ## Defining JavaScript interfaces with traits
 
 Most JavaScript APIs work with interfaces that are defined structurally. In