Getting strange behavior when calling function outside of a closure: when function is in a object everything is working when function is in a class get : Task not serializable: java.io.NotSerializableException: testing The problem is I need my code in a class and not an object. Any idea why this is happening? Is a Scala … Read more
Are there any best-practice guidelines on when to use case classes (or case objects) vs extending Enumeration in Scala? They seem to offer some of the same benefits. 14 Answers 14
I can’t add an element of type T into a list List[T]. I tried with myList ::= myElement but it seems it creates a strange object and accessing to myList.last always returns the first element that was put inside the list. How can I solve this problem? 6 Answers 6
As I understand it, in Scala, a function may be called either by-value or by-name For example, given the following declarations, do we know how the function will be called? Declaration: def f (x:Int, y:Int) = x; Call f (1,2) f (23+55,5) f (12+3, 44*11) What are the rules please? 17 Answers 17
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago. Improve this question What’s the best way to parse command-line parameters in Scala? I personally prefer something lightweight that … Read more
I have followed the tutorial at Scala and Android with Scala 2.7.3 final. The resulting Android App works but even the most basic application takes several minutes (!) to compile and needs 900 kb compressed, which is a show stopper for mobile applications. Additionally, the IDE runs out of memory every now and then. I … Read more
I was reading A Tour of Scala: Abstract Types. When is it better to use abstract types? For example, abstract class Buffer { type T val element: T } rather that generics, for example, abstract class Buffer[T] { val element: T } 4 Answers 4
I noticed that Scala provide lazy vals. But I don’t get what they do. scala> val x = 15 x: Int = 15 scala> lazy val y = 13 y: Int = <lazy> scala> x res0: Int = 15 scala> y res1: Int = 13 The REPL shows that y is a lazy val, but … Read more
I read Scala Functions (part of Another tour of Scala). In that post he stated: Methods and functions are not the same thing But he didn’t explain anything about it. What was he trying to say? 10 Answers 10
I’m trying to call a Shapeless macro from inside a quasiquote with Scala and I’m not getting what I would like to get. My macro doesn’t return any errors but it doesn’t expand Witness(fieldName) into Witness.Lt[String] val implicits = schema.fields.map { field => val fieldName:String = field.name val fieldType = TypeName(field.valueType.fullName) val in = TermName(“implicitField”+fieldName) … Read more
