部分應用遞歸函數

Question

def mainCaller() = { 
    val name = "xyz" 
    someList.foreach { u:Map => foo(name, u) } 
} 

def foo(name:String)(map:Map): Unit = { 
    //match case.... 
    //recursive call to foo in each case where name remains same, but map changes 
} 

我怎麼能寫FOO作爲一個部分應用功能，在這裏我不必在每一個遞歸調用傳遞的名字，只是叫foo(map1)？

Answer 1

兩個選項：

def foo(name:String)(map:Map): Unit = { 
    val bar = foo(name)_ 
    //match case... 
    // case 1: 
    bar(x) 

    // case 2: 
    bar(y) 
} 

或者：

def foo(name:String): Map => Unit = { 
    def bar(map: Map): Unit = { 
     //match case... 
     // case 1: 
     bar(x) 

     // case 2: 
     bar(y) 
    } 
    bar 
}