- scala> def lineCount = {
- | import scala.io._ // the '_' character is the wildcard in scala
- | Source.fromURL("http://www.google.com").getLines.foldRight(0)( (line, acc) => acc + 1 )
- | }
- lineCount: Int
- scala> lineCount
- res1: Int = 11
- scala> def lineCount = {
- | import scala.io.Source
- | Source.fromURL("http://www.google.com").getLines.foldRight(0)( (line, acc) => acc + 1 )
- | }
- lineCount: Int
- scala> lineCount
- res3: Int = 11
- scala> def lineCount = {
- | import scala.io.Source.fromURL // import the fromURL method, only methods from objects can be imported.
- | fromURL("http://www.google.com").getLines.foldRight(0)( (line, acc) => acc + 1 )
- | }
- lineCount: Int
- scala> lineCount
- res4: Int = 11
- scala> def lineCount = {
- | import scala.io.Source.{fromURL => url} // you can remap imports to another name
- | url("http://www.google.com").getLines.foldRight(0)( (line, acc) => acc + 1 )
- | }
- lineCount: Int
- scala> lineCount
- res5: Int = 11
- scala> import java.io.{File, FileWriter} // you can import multiple classes in one statement
- import java.io.{File, FileWriter}
- scala> println( classOf[File], classOf[FileWriter])
- (class java.io.File,class java.io.FileWriter)
Wednesday, August 19, 2009
Imports
Scala's mechanism for importing is analogous to Java's import statements but provides more options. For example import statements can be anywhere in the file and only apply to the scope that they are declared in.
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