Partially applied recursive functions

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
}

how can I write foo as a partially applied function, where I dont have to pass name in every recursive call and just call foo(map1)?

sepp2k · Accepted Answer · 2010-07-06 00:35:31Z

8

Two options:

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

    // case 2:
    bar(y)
}

Or:

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

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

edited Jul 6, 2010 at 0:35

answered Jul 6, 2010 at 0:21

sepp2k

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2 Comments

scout Over a year ago

Simply brilliant!! Do the two have any advantages and disadvantages. The first method looks much cleaner.

sepp2k Over a year ago

@scout: I can't think of any (dis)advantages for either. I made a mistake btw. In the first example it needs an underscore after foo(name).

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