rewrote in worksheet mode

Author: ZeonTrevor

tutorials/tour/_posts/2017-02-13-nested-functions.md

@@ -14,17 +14,16 @@ previous-page: higher-order-functions
 In Scala it is possible to nest function definitions. The following object provides a `factorial` function for computing the factorial of a given number:
 
 ```tut
-object FactorialTest extends App {
-  def factorial(x: Int): Int = {
+ def factorial(x: Int): Int = {
     def fact(x: Int, accumulator: Int): Int = {
       if (x <= 1) accumulator
       else fact(x - 1, x * accumulator)
     }  
     fact(x, 1)
-  }
-  println("Factorial of 2: " + factorial(2))
-  println("Factorial of 3: " + factorial(3))
-}
+ }
+
+ println("Factorial of 2: " + factorial(2))
+ println("Factorial of 3: " + factorial(3))
 ```
 
 _Note: the nested function `fact` refers to variable `x` defined in the outer scope as a parameter value of `factorial`._