In Scala it is possible to nest method definitions. The following object provides a factorial method for computing the factorial of a given number:
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)) def factorial(x: Int): Int = def fact(x: Int, accumulator: Int): Int = if x <= 1 then accumulator else fact(x - 1, x * accumulator) fact(x, 1) println("Factorial of 2: " + factorial(2)) println("Factorial of 3: " + factorial(3)) The output of this program is:
Factorial of 2: 2 Factorial of 3: 6