scala-2.10

I am able to print data in two RDD with the below code. usersRDD.foreach(println) empRDD.foreach(println) I need to compare data in two RDDs. How can I iterate and compare field data in one RDD with field data in another RDD. Eg: iterate the records and check if name and age in userRDD has a matching record in empRDD , if no put in separate RDD. I tried with userRDD.substract(empRDD) but it was comparing all the fields. Sean Owen You need to key the data in each RDD so that there is something to join records on. Have a look at groupBy for example. Then you join the resulting RDDs. For each key

I'm experimenting with the scala 2.10 macro features. I have trouble using LabelDef in some cases, though. To some extent I peeked in the compiler's code, read excerpts of Miguel Garcia's papers but I'm still stuck. If my understanding is correct , a pseudo-definition would be: LabelDef(labelName, listOfParameters, stmsAndApply) where the 3 arguments are Trees and: - labelName is the identifier of the label $L being defined - listOfParameters correspond to the arguments passed when label- apply occurs, as in $L(a1,...,an) , and can be empty - stmsAndApply corresponds to the block of statements

I am new to Scala and play 2.1 and I come from a PHP background. I am not able to print the @ symbol in HTML. I am getting the following error: not found: value Hotmail Here is my code: myname<label>@Hotmail.com</label> Please let me know how I can print the @ symbol. Thanks in advance. Double it: myname<label>@@Hotmail.com</label> It's called escape syntax. Other rules for play template framework can be found here You can also write HTML Entity code &#64 for printing @ symbol in your view file. 来源： https://stackoverflow.com/questions/19157571/how-to-print-symbol-in-html-with-play-framework

Is there any working solution for dropping into REPL console with for Scala 2.10? This is mainly for debugging purpose - I want to pause in the middle of execution, and have a REPL console where I can inspect values and test the program's logic using complex expressions within my program at the current state of execution. Those who have programmed in Ruby might know similar function: the binding.pry . AFAIK, Scala 2.9 and under used to have breakIf but it has been removed from the later versions. Using ILoop seems to be the new way but introduced issues due to sbt not adding scala-library to

I'm using spray-json to marshal lists of custom objects into JSON. I have the following case class and its JsonProtocol. case class ElementResponse(name: String, symbol: String, code: String, pkwiu: String, remarks: String, priceNetto: BigDecimal, priceBrutto: BigDecimal, vat: Int, minInStock:Int, maxInStock: Int) object JollyJsonProtocol extends DefaultJsonProtocol with SprayJsonSupport { implicit val elementFormat = jsonFormat10(ElementResponse) } When I try to put in in a route like this one: get { complete { List(new ElementResponse(...), new ElementResponse(...)) } } I get an error saying

Could you tell me why sbt compile doesn't copy unmanaged resources to classpath? On the other hand sbt package does. As result I can't start debugging unless I invoke package call manually :( I'm using SBT 0.12.1 Below is my build.sbt. import AssemblyKeys._ // put this at the top of the file net.virtualvoid.sbt.graph.Plugin.graphSettings assemblySettings organization := "com.zzz" version := "0.1" scalaVersion := "2.10.2" scalacOptions := Seq("-unchecked", "-language:reflectiveCalls,postfixOps,implicitConversions", "-deprecation", "-feature", "-encoding", "utf8") unmanagedResourceDirectories in

Back when reflection was still incipient, on the days of Scala 2.10.0 milestones, I asked a question about how could I use it to see the trees of code snippets from REPL. The excellent answer went further than I asked, and showed how they can be used to parse and evaluate trees as well, so I went ahead and tried to use that on a little project I had going on today. Unfortunately, code parsed and evaluated that way doesn't seem to see any REPL definition: scala> val x = 1 x: Int = 1 scala> import scala.tools.reflect.ToolBox import scala.tools.reflect.ToolBox scala> val tb = scala.reflect

The new Future in Scala 2.10 uses an execution context for every operation where an action is called asynchronously (including map , filter , etc). Does this mean that every action will always be called individually through the execution context, or is it possible that this step is optimized away when chaining multiple transformations/filters each using the same execution context? I.e. if doing f.map(...).filter(...).map(...) , all with the same execution context, will this call execute() once (because it's clever enough to compose a synchronous function from the above), or three times? If the