alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Scala example source code file (Nothing.scala)

This example Scala source code file (Nothing.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

nothing

The Nothing.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala

/** `Nothing` is - together with [[scala.Null]] - at the bottom of Scala's type hierarchy.
 *
 *  `Nothing` is a subtype of every other type (including [[scala.Null]]); there exist
 *  ''no instances'' of this type.  Although type `Nothing` is uninhabited, it is
 *  nevertheless useful in several ways.  For instance, the Scala library defines a value
 *  [[scala.collection.immutable.Nil]] of type `List[Nothing]`. Because lists are covariant in Scala,
 *  this makes [[scala.collection.immutable.Nil]] an instance of `List[T]`, for any element of type `T`.
 *
 *  Another usage for Nothing is the return type for methods which never return normally.
 *  One example is method error in [[scala.sys]], which always throws an exception.
 */
sealed trait Nothing

Other Scala source code examples

Here is a short list of links related to this Scala Nothing.scala source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.