nested-functions.md

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In Scala it is possible to nest method definitions. The following object provides a factorial method for computing the factorial of a given number:

{% scalafiddle %}

 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))

{% endscalafiddle %}

The output of this program is:

Factorial of 2: 2
Factorial of 3: 6