Syntax understanding of scala function


override def generateJob(time: Time): Option[Job] = {
    parent.getOrCompute(time) match {
      case Some(rdd) =>
        val jobFunc = () => createRDDWithLocalProperties(time, displayInnerRDDOps) {
          foreachFunc(rdd, time)
        }
        Some(new Job(time, jobFunc))
      case None => None
    }
  }


val jobFunc = () => createRDDWithLocalProperties(time, displayInnerRDDOps) {
          foreachFunc(rdd, time)
        }
        
        createRDDWithLocalProperties
Scala
Mar.01,2021

I don't know what other code looks like in your context, but if you're just trying to figure out what curly braces are for, here's an example: 

val a = 1
val b = 2

val func = abstractAdd(a,b){
  addImpl
}

def abstractAdd(a: Int, b: Int)(tryDo: (Int, Int) => Int): Int = {
  tryDo(a, b)
}

def addImpl(a: Int, b: Int): Int = a + b

We have an operation abstractAdd that doesn't know how to add. In addition to passing in a and b to add, we also need to pass in a function that actually implements the addition. func implements the addition operation completely.

knowledge points involved: Coriarization , higher order functions 

.  createRDDWithLocalProperties
createRDDWithLocalProperties(time, displayInnerRDDOps) {
          foreachFunc(rdd, time)
        }

Previous: Sometimes watch can't listen.

Next: Mini Program login status problem

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
© 2021 CodesHelper
Advertising Contact us About us
Menu