在Scala中是可以定義嵌套函數(shù)的。下面定義了函數(shù)factorial锁保，用于計(jì)算給定數(shù)字的階乘：
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))
程序輸出結(jié)果是：
Factorial of 2: 2
Factorial of 3: 6
