Editing Iterator (section)

=== Scala ===
In [[Scala (programming language)|Scala]], iterators have a rich set of methods similar to collections, and can be used directly in for loops. Indeed, both iterators and collections inherit from a common base trait - <code>scala.collection.TraversableOnce</code>. However, because of the rich set of methods available in the Scala collections library, such as <code>map</code>, <code>collect</code>, <code>filter</code> etc., it is often not necessary to deal with iterators directly when programming in Scala.

Java iterators and collections can be automatically converted into Scala iterators and collections, respectively, simply by adding the single line

<syntaxhighlight lang="scala">
import scala.collection.JavaConversions._
</syntaxhighlight>

to the file. The <code>JavaConversions</code> object provides implicit conversions to do this. Implicit conversions are a feature of Scala: methods that, when visible in the current scope, automatically insert calls to themselves into relevant expressions at the appropriate place to make them typecheck when they otherwise would not.