Packages and Imports

Local Import

Import inside a method, close to where it is used.

local-import An import can sit inside a method so the name is only visible there. This keeps a helper like `sqrt` scoped to the code that needs it.

Local Import

n
LocalImport.scala
Replay: real traced execution (multi-file project)
object Main {
  def main(args: Array[String]): Unit = {
    val n = 16
    import scala.math.sqrt
    val root = sqrt(n).toInt

    println("n=" + n)
    println("root=" + root)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val n = 9
    import scala.math.sqrt
    val root = sqrt(n).toInt

    println("n=" + n)
    println("root=" + root)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val n = 25
    import scala.math.sqrt
    val root = sqrt(n).toInt

    println("n=" + n)
    println("root=" + root)
  }
}

  1. n ← 16, root ← 4

    1object Main {2  def main(args: Array[String]): Unit = {3    val n→ 16 = 16 //@n=9, 254    import scala.math.sqrt5    val root→ 4 = sqrt(n)4.0.toInt67    println("n=" + n16)8    println("root=" + root4)9  }10}
    outputn=16
root=4

  1. n ← 9, root ← 3

    1object Main {2  def main(args: Array[String]): Unit = {3    val n→ 9 = 94    import scala.math.sqrt5    val root→ 3 = sqrt(n)3.0.toInt67    println("n=" + n9)8    println("root=" + root3)9  }10}
    outputn=9
root=3

  1. n ← 25, root ← 5

    1object Main {2  def main(args: Array[String]): Unit = {3    val n→ 25 = 254    import scala.math.sqrt5    val root→ 5 = sqrt(n)5.0.toInt67    println("n=" + n25)8    println("root=" + root5)9  }10}
    outputn=25
root=5