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new on the blog: scala ❤️ pride 2018 documentation download community libraries contribute blog scala combines object-oriented and functional programming in one concise, high-level language. scala's static types help avoid bugs in complex applications, and its jvm and javascript runtimes let you build high-performance systems with easy access to huge ecosystems of libraries. learn more scala began life in 2003, created by martin odersky and his research group at epfl, next to lake geneva and the alps, in lausanne, switzerland. scala has since grown into a mature open source programming language, used by hundreds of thousands of developers, and is developed and maintained by scores of people all over the world. download getting started milestones, nightlies, etc. all previous releases api docs current api docs api docs (other versions) scala documentation language specification scala 2.12.6 scala runs on... beta scala in a nutshell click the boxes below to see scala in action! seamless java interop scala runs on the jvm, so java and scala stacks can be freely mixed for totally seamless integration. type inference so the type system doesn’t feel so static. don’t work for the type system. let the type system work for you! concurrency & distribution use data-parallel operations on collections, use actors for concurrency and distribution, or futures for asynchronous programming. author.scala class author(val firstname: string, val lastname: string) extends comparable[author] { override def compareto(that: author) = { val lastnamecomp = this.lastname compareto that.lastname if (lastnamecomp != 0) lastnamecomp else this.firstname compareto that.firstname } } object author { def loadauthorsfromfile(file: java.io.file): list[author] = ??? } app.java import static scala.collection.javaconversions.asjavacollection; public class app { public list<author> loadauthorsfromfile(file file) { return new arraylist<author>(asjavacollection( author.loadauthorsfromfile(file))); } public void sortauthors(list<author> authors) { collections.sort(authors); } public void displaysortedauthors(file file) { list<author> authors = loadauthorsfromfile(file); sortauthors(authors); for (author author : authors) { system.out.println( author.lastname() + ", " + author.firstname()); } } } combine scala and java seamlessly scala classes are ultimately jvm classes. you can create java objects, call their methods and inherit from java classes transparently from scala. similarly, java code can reference scala classes and objects. in this example, the scala class author implements the java interface comparable<t> and works with java file s. the java code uses a method from the companion object author , and accesses fields of the author class. it also uses javaconversions to convert between scala collections and java collections. type inference scala> class person(val name: string, val age: int) { | override def tostring = s"$name ($age)" | } defined class person scala> def underagepeoplenames(persons: list[person]) = { | for (person <- persons; if person.age < 18) | yield person.name | } underagepeoplenames: (persons: list[person])list[string] scala> def createrandompeople() = { | val names = list("alice", "bob", "carol", | "dave", "eve", "frank") | for (name <- names) yield { | val age = (random.nextgaussian()*8 + 20).toint | new person(name, age) | } | } createrandompeople: ()list[person] scala> val people = createrandompeople() people: list[person] = list(alice (16), bob (16), carol (19), dave (18), eve (26), frank (11)) scala> underagepeoplenames(people) res1: list[string] = list(alice, bob, frank) let the compiler figure out the types for you the scala compiler is smart about static types. most of the time, you need not tell it the types of your variables. instead, its powerful type inference will figure them out for you. in this interactive repl session (read-eval-print-loop), we define a class and two functions. you can observe that the compiler infers the result types of the functions automatically, as well as all the intermediate values. concurrent/distributed val x = future { someexpensivecomputation() } val y = future { someotherexpensivecomputation() } val z = for (a <- x; b <- y) yield a*b for (c <- z) println("result: " + c) println("meanwhile, the main thread goes on!") go concurrent or distributed with futures & promises in scala, futures and promises can be used to process data asynchronously , making it easier to parallelize or even distribute your application. in this example, the future{} construct evaluates its argument asynchronously, and returns a handle to the asynchronous result as a future[int] . for-comprehensions can be used to register new callbacks (to post new things to do) when the future is completed, i.e., when the computation is finished. and since all this is executed asynchronously, without blocking, the main program thread can continue doing other work in the meantime. traits combine the flexibility of java-style interfaces with the power of classes. think principled multiple-inheritance. pattern matching think “switch” on steroids. match against class hierarchies, sequences, and more. higher-order functions functions are first-class objects. compose them with guaranteed type safety. use them anywhere, pass them to anything. traits abstract class spacecraft { def engage(): unit } trait commandobridge extends spacecraft { def engage(): unit = { for (_ <- 1 to 3) speedup() } def speedup(): unit } trait pulseengine extends spacecraft { val maxpulse: int var currentpulse: int = 0 def speedup(): unit = { if (currentpulse < maxpulse) currentpulse += 1 } } class starcruiser extends spacecraft with commandobridge with pulseengine { val maxpulse = 200 } flexibly combine interface & behavior in scala, multiple traits can be mixed into a class to combine their interface and their behavior. here, a starcruiser is a spacecraft with a commandobridge that knows how to engage the ship (provided a means to speed up) and a pulseengine that specifies how to speed up. switch on the structure of your data in scala, case classes are used to represent structural data types. they implicitly equip the class with meaningful tostring , equals and hashcode methods, as well as the ability to be deconstructed with pattern matching . in this example, we define a small set of case classes that represent binary trees of integers (the generic version is omitted for simplicity here). in inorder , the match construct chooses the right branch, depending on the type of t , and at the same time deconstructs the arguments of a node . pattern matching // define a set of case classes for representing binary trees. sealed abstract class tree case class node(elem: int, left: tree, right: tree) extends tree case object leaf extends tree // return the in-order traversal sequence of a given tree. def inorder(t: tree): list[int] = t match { case node(e, l, r) => inorder(l) ::: list(e) ::: inorder(r) case leaf => list() } go functional with higher-order functions in scala, functions are values, and can be defined as anonymous functions with a concise syntax. scala val people: array[person] // partition `people` into two arrays `minors` and `adults`. // use the higher-order function `(_.age < 18)` as a predicate for partitioning. val (minors, adults) = people partition (_.age < 18) java list<person> people; list<person> minors = new arraylist<person>(people.size()); list<person> adults = new arraylist<person>(people.size()); for (person person : people) { if (person.getage() < 18) minors.add(person); else adults.add(person); } learn more or visit the scala documentation ides for scala intellij (with plugin) sublime text atom scala ide (eclipse-based) run scala in your browser scastie is scala + sbt in your browser! you can use any version of scala, or even alternate backends s

URL analysis for scala-lang.org

https://www.scala-lang.org/documentation/
https://www.scala-lang.org/conduct.html
https://www.scala-lang.org/community/index.html#chat-rooms
https://www.scala-lang.org/blog/2018/06/14/accessible-scala.html
https://www.scala-lang.org/api/current/?_ga=1.241039811.1310790544.1468501313
https://www.scala-lang.org/community/index.html#community-libraries-and-tools
https://www.scala-lang.org/blog/
https://www.scala-lang.org/download/
https://www.scala-lang.org/events/
https://www.scala-lang.org/what-is-scala/
https://www.scala-lang.org/license/
https://www.scala-lang.org/api/current/index.html
https://www.scala-lang.org/blog/2018/06/15/bsp.html
https://www.scala-lang.org/blog/2018/06/13/scala-213-collections.html
https://www.scala-lang.org/download

Whois Information

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Domain Name: SCALA-LANG.ORG
Registry Domain ID: D137460179-LROR
Registrar WHOIS Server: whois.gandi.net
Registrar URL: http://www.gandi.net
Updated Date: 2018-01-02T10:40:00Z
Creation Date: 2007-01-16T09:47:33Z
Registry Expiry Date: 2019-01-16T09:47:33Z
Registrar Registration Expiration Date:
Registrar: Gandi SAS
Registrar IANA ID: 81
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +33.170377661
Reseller:
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Registrant Organization: Fabien SALVI
Registrant State/Province:
Registrant Country: CH
Name Server: NS-191-A.GANDI.NET
Name Server: NS-47-B.GANDI.NET
Name Server: NS-78-C.GANDI.NET
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of WHOIS database: 2018-07-12T11:09:54Z <<<

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Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.

  REFERRER http://www.pir.org/

  REGISTRAR Public Interest Registry

SERVERS

  SERVER org.whois-servers.net

  ARGS scala-lang.org

  PORT 43

  TYPE domain

DOMAIN

  NAME scala-lang.org

  HANDLE D137460179-LROR

  CREATED 2007-01-16

STATUS
clientTransferProhibited https://icann.org/epp#clientTransferProhibited

NSERVER

  NS-191-A.GANDI.NET 173.246.98.2

  NS-47-B.GANDI.NET 213.167.229.2

  NS-78-C.GANDI.NET 217.70.179.2

OWNER

  ORGANIZATION Fabien SALVI

ADDRESS

  COUNTRY CH

  REGISTERED yes

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