Why is it possible to declare variable with same name in the REPL?

by

The interesting design feature of the REPL is that your two definitions are translated to:

object A {
  val greeting = "hi"
}
object B {
  val greeting = "bye"
}

A subsequent usage will import the last definition:

object C {
  import B.greeting
  val message = s"$greeting, Bob."  // your code
}

You can witness the exact wrapping strategy with scala -Xprint:parser:

object $iw extends scala.AnyRef {
  def <init>() = {
    super.<init>();
    ()
  };
  import $line4.$read.$iw.$iw.greeting;
  object $iw extends scala.AnyRef {
    def <init>() = {
      super.<init>();
      ()
    };
    val message = StringContext("", ", Bob.").s(greeting)
  }
}

More Related Contents:

  1. How to use third party libraries with Scala REPL?
  2. Auto generation of array(string)
  3. How to define and use a User-Defined Aggregate Function in Spark SQL?
  4. How to write to a file in Scala?
  5. Iteration over a sealed trait in Scala?
  6. Where does the “flatmap that s***” idiomatic expression in Scala come from?
  7. Caused by: java.lang.NullPointerException at org.apache.spark.sql.Dataset
  8. About how to add a new column to an existing DataFrame with random values in Scala
  9. How to compare two dataframe and print columns that are different in scala
  10. Scala double definition (2 methods have the same type erasure)
  11. How to apply a function to a tuple?
  12. What are the differences between asInstanceOf[T] and (o: T) in Scala?
  13. Spark: Transpose DataFrame Without Aggregating
  14. Advantages of F-bounded polymorphism over typeclass for return-current-type problem
  15. Can multi-projects from GIT be used as SBT dependencies?
  16. ScalaTest in sbt: is there a way to run a single test without tags?
  17. Differences between these three ways of defining a function in Scala
  18. How to reference external sbt project from another sbt project?
  19. How can I connect to a postgreSQL database into Apache Spark using scala?
  20. How to use IntelliJ with Play Framework and Scala
  21. How to serve uploaded files in Play!2 using Scala?
  22. Missing parameter type error by calling toSet?
  23. Spark column string replace when present in other column (row)
  24. Dynamically compiling scala class files at runtime in Scala 2.11
  25. scala f-bounded types explanation
  26. Scala variable argument list with call-by-name possible?
  27. How to vectorize DataFrame columns for ML algorithms?
  28. Scalaz Bind[Seq] typeclass
  29. Getting subclasses of a sealed trait
  30. How to instantiate an instance of type represented by type parameter in Scala

Leave a Comment