Scala部分应用函数

scala部分应用函数不仅可以用在普通函数上，也可以用在类的方法上

（1）在普通函数上的应用

def sum(a: Int, b: Int, c: Int) = {
    a + b + c
}

val sum1 = sum(_: Int, 2, 3)

sum1: Int => Int = <function1>

sum1(1)

执行结果：res1: Int = 6

（2）在类方法上的应用

trait Base {
    def print(msg: String)
}

class SubOne extends Base {
    override def print(msg: String): Unit = {
        println("#In SubOne: " + msg)
    }
}

class SubTwo extends Base {
    override def print(msg: String): Unit = {
        println("#In SubTwo: " + msg)
    }
}

val f = (_: Base).print("Hello")  // f: Base => Unit = <function1>
val one = new SubOne
val two = new SubTwo

f(one)<span style="white-space:pre">	</span>// 执行结果：#In SubOne: Hello

f(two)<span style="white-space:pre">	</span>// 执行结果：#In SubTwo: Hello

来源：CSDN

作者：ktlinker1119

链接：https://blog.csdn.net/ktlinker1119/article/details/44592469