Scala Collections for the Easily Bored Part 2: One at a Time 28 Jul 2008 As I hinted previously, this series is intended to delve into Scala’s extensive collections API and the many ways in which it can make your life easier. Probably the most important operations you could ever perform on collections are those which examine each element, one at a time. After all, what’s a more common array idiom than looping over all values? In that vein, this article starts by looking at foreach, the imperative programmer’s bread-and-butter when it comes to types like Array and List. Iterating As I said above, looping over every item in a collection is probably the most heavily used operation in a programmer’s repertoire. This code should be old hat to anyone coming from a Java background. In this case, we aren’t using a loop of any kind, but rather creating a block (Ruby’s name for a closure) which takes a single parameter and passes it to the built-in puts method. The same approach is taken in Scala. Folding Yeah, I can’t read it either. Reduce Mapping Binding
First Steps to Scala ScalazineFirst Steps to Scalaby Bill Venners, Martin Odersky, and Lex SpoonMay 9, 2007 Summary In this article, you'll follow twelve steps that are designed to help you understand and gain some basic skills in the Scala programming language. Scala is a statically typed, object-oriented programming language that blends imperative and functional programming styles. Scala is designed to integrate easily with applications that run on modern virtual machines, primarily the Java virtual machine (JVM). Scala was developed starting in 2003 by Martin Odersky's group at EPFL, Lausanne, Switzerland. One reason you might want to use Scala is that it allows you to increase your productivity compared to Java while leveraging JVM execution speed, your existing investments in Java code, knowledge, and the vast array of APIs available for the JVM. In Italian, Scala means staircase. To run the examples in this article, you should download Scala from the Scala Downloads page. scala> 1 + 2 unnamed0: Int = 3 #!
InfoQ: Scala & Spring: Combine the best of both worlds Introduction Scala is a great programming language combining a concise and legible syntax with a seamless fusion of the object-oriented and functional programming paradigm that is fully compatible with Java. The latter makes it possible to combine Scala with Java APIs and frameworks that Java developers are familiar with. In this article I will show how Spring, one of the most popular frameworks, can be leveraged by means of Scala. In order to demonstrate how Scala compliments Spring this article is based on a simple sample application. The domain model resembles a mini version of a social networking application. Step 1 Based on this domain model, first of all, this article shows how to implement a generic Data Access Object (DAO) and a concrete DAO for the Person entity in Scala making use of Hibernate/JPA. val p1 = new Person(“Rod Johnson”) val p2 = dao.findByName(“Martin Odersky”) p1.link(p2) personDao.save(p1) Step 2 Step 3 Person(“Martin Odersky”).save Requirements Implementation Usage:
'scala' tag wiki Daily scala The busy Java developer's guide to Scala: Collection types For the Java™ developer learning Scala, objects provide a natural and easy point of entry. Over the past several articles in this series, I've introduced you to some of the ways that object-oriented programming in Scala really isn't much different from Java programming. I've also shown you how Scala revisits traditional object-oriented concepts, finds them wanting, and reinvents them for the 21st century. Something important has been lurking behind the curtain all this time, however, waiting to emerge: Scala is also a functional language. Scala's functional orientation is worth exploring, and not only because you've run out of objects to play with. You'll take your first real foray into functional programming with Scala this month, with a look at four types common to most functional languages: lists, tuples and sets, and the Option type. Each of these types offers a new way to think about writing code. Exercise your Option(s) When is nothing not really nothing? Listing 1. Listing 2.
Programming in Scala, First Edition Programming in Scala, First Editionby Martin Odersky, Lex Spoon, and Bill VennersDecember 10, 2008 Martin Odersky made a huge impact on the Java world with his design of the Pizza language. Although Pizza itself never became popular, it demonstrated that object-oriented and functional language features, when combined with skill and taste, form a natural and powerful combination. Pizza's design became the basis for generics in Java, and Martin's GJ (Generic Java) compiler was Sun Microsystem's standard compiler starting in 1.3 (though with generics disabled). Since that time, we at Sun tried to simplify program development by extending the language with piecemeal solutions to particular problems, like the for-each loop, enums, and autoboxing. Lately, there has been a backlash against statically typed languages. Scala is a tastefully typed language: it is statically typed, but explicit types appear in just the right places. Will Scala be the next great language? Who should read this book
implicit.ly - Scala software, hot off the presses Introduction Scala is a modern multi-paradigm programming language designed to express common programming patterns in a concise, elegant, and type-safe way. It smoothly integrates features of object-oriented and functional languages. Scala is object-oriented Scala is a pure object-oriented language in the sense that every value is an object. Scala is functional Scala is also a functional language in the sense that every function is a value. Furthermore, Scala’s notion of pattern matching naturally extends to the processing of XML data with the help of right-ignoring sequence patterns. Scala is statically typed Scala is equipped with an expressive type system that enforces statically that abstractions are used in a safe and coherent manner. A local type inference mechanism takes care that the user is not required to annotate the program with redundant type information. Scala is extensible In practice, the development of domain-specific applications often requires domain-specific language extensions.
Scala 2.8 Collections API -- Arrays Array is a special kind of collection in Scala. On the one hand, Scala arrays correspond one-to-one to Java arrays. That is, a Scala array Array[Int] is represented as a Java int[], an Array[Double] is represented as a Java double[] and a Array[String] is represented as a Java String[]. But at the same time, Scala arrays offer much more than their Java analogues. Given that Scala arrays are represented just like Java arrays, how can these additional features be supported in Scala? The Scala 2.8 design is much simpler. The interaction above demonstrates that arrays are compatible with sequences, because there's an implicit conversion from arrays to WrappedArrays. There is yet another implicit conversion that gets applied to arrays. The difference between the two implicit conversions on arrays is shown in the next REPL dialogue: You see that calling reverse on seq, which is a WrappedArray, will give again a WrappedArray. The two revised versions of evenElems mean exactly the same.
10 Scala One Liners to Impress Your Friends - @sologco Register These Currently Available Domains Today Search for your ideal .CO Web Address Get it now before it's gone! Close Notify me when the auction is scheduled for Thank you for inquiring about this premium domain. I'm sorry, but an error occurred. Recently Sold .CO Domains soso.co | $6,400 flip.co | $10,600 ban.co | $24,500 3dtv.co | $5,200 duilawyer.co | $43,000 rollerblades.co | $5,000 socialsecuritydisability.co | $6,900 rakeback.co | $8,550 newcars.co | $8,000 mylawyer.co | $5,100 duiattorney.co | $44,500 fairfield.co | $7,210 paydayloans.co | $9,375 drive.co | $5,110 nos.co | $6,110 What is .CO ? .CO is the new web address that gives you a truly global, recognizable, and credible option for branding your online presence.
Roundup: Scala for Java Refugees - Code Commit 13 Feb 2008 To be honest, I’m somewhat kicking myself for writing this post. As I’ve said many times: roundup posts are for people who are too lazy to write real content. I can’t tell you how many blogs I’ve come across which have a roundup-to-post ratio of easily 3:1. You know it’s a bad sign when sites start having roundups of their roundups… Meta-roundups aside, I decided (after much deliberation) that a single post linking to all six parts of the series would be useful to one or two people. Of course it’s always possible that you subscribe to my way of looking at things. Part 1: main(String[]) Introductory article giving motivation for learning Scala and some first steps to “get your feet wet” in the language. Part 2: Basic OOP Looking at Scala’s syntax in a little more detail. Part 3: Methods and Statics Scala’s method syntax is far too powerful to cover in a single post. Part 4: Pattern Matching and Exceptions Part 5: Traits and Types Part 6: Getting Over Java
Scala School Other Languages: About Scala school started as a series of lectures at Twitter to prepare experienced engineers to be productive Scala programmers. Approach We think it makes the most sense to approach teaching Scala not as if it were an improved Java but instead as a new language. Most of the lessons require no software other than a Scala REPL. Also You can learn more elsewhere:
Scala 2.8 Collections API September 7, 2010 In the eyes of many, the new collections framework is the most significant change in Scala 2.8. Scala had collections before (and in fact the new framework is largely compatible with them). Even though the additions to collections are subtle at first glance, the changes they can provoke in your programming style can be profound. Easy to use: A small vocabulary of 20-50 methods is enough to solve most collection problems in a couple of operations. Concise: You can achieve with a single word what used to take one or several loops. Safe: This one has to be experienced to sink in. Fast: Collection operations are tuned and optimized in the libraries. Universal: Collections provide the same operations on any type where it makes sense to do so. Example: Here's one line of code that demonstrates many of the advantages of Scala's collections. It's immediately clear what this operation does: It partitions a collection of people into minors and adults depending on their age. Next: