如何使这个断言通过

Question

我很困惑如何做到这一点。我需要将它转换为String。我试过x.toString，但它看不起作用。

def doSomething(x: Int, function: Int => String): String = ???

assert(doSomething(5, (i: Int) => i.toString) == "5")
assert(doSomething(7, (i: Int) => (i + 5).toString) == "12")

Answer 1

您需要实际调用或应用函数...，如：

def doSomething(x: Int, function: Int => String): String = function(x)

Answer 2

尝试def doSomething(x: Int, function: Int => String): String = function(x)，???只是Scala中的占位符。