9.scala嵌套方法

Posted 2021-04-25 大数据群英萃

在Scala中可以嵌套定义方法。例如以下对象提供了一个factorial方法来计算给定数值的阶乘：

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))

程序的输出为:

Factorial of 2: 2Factorial of 3: 6