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A method can appear as part of an expression (call a function and pass a parameter), but the method (with the parameter method) cannot be the final expression,But the function can appear as the final expression:Scala>//Define a methodScala> def m (x:int) = 2*xM: (x:int) IntScala>//define a functionScala> val f = (x:int) = 2*xF:int = Int = Scala>//method cannot appear as a final expressionScala> mFollow this method with ' _ ' If you want to treat it as

Scala entry-Eclipse Development Environment setup Due to the need for deep learning, I recently started to learn Scala, an artistic programming language. Scala: a java-like programming. Integrates the features of Object-Oriented (Oriented) programming and Functional (Functional programming) programming, which facilitates the development of multi-core concurrency

To use Spark, learn Scala first.Reference Tutorial: Http://meetfp.com/zh/scala-basicOnline compilation: Http://meetfp.com/tryoutOther information: HTTP://SCALACHINA.COM/NODE/16 http://blog.csdn.net/mapdigit/article/details/21878083Characteristics: Scala is a purely object-oriented language, all objects: Unify primitive types and classes, and unify functi

Array-related operations Summary:This article mainly learns how to manipulate arrays in Scala. Java and C + + programmers typically use arrays or approximate structures , such as array lists or vectors , to collect a set of elements. In Scala, we have more choices, but now let's assume that we don't care about other choices, but just want to start using arrays right away. The main points of this

This is a creation in Article, where the information may have evolved or changed. See the previous: Java, Scala, and go languages multi-threaded concurrency comparison test. Related code Download: http://qinhui99.itpub.net/resource/2570/31876Test results and conclusionsCount the number of prime numbers in a 1~n, and record the time spent. The same n, the less time performance the better. AMD Dual Core 2.8G, 4G memory winxp Java+conc java+akka1.3java+a

Scala is written specifically for the Java™ platform, so its syntax design makes Java code-coding people feel relaxed. At the same time, Scala provides the JVM with the inherent power of functional languages, and starts with these functional design concepts. In this issue of the Scala Guide series for Java developers, Ted Neward will introduce nuances between the

Let me start with Scala and get to know Scala in this chapter: 1, why I study Scala, the difference between her and Java 2, basic types in Scala and Operations 3, Scala classes and objects Why I study Scala, the difference betwee

I've written about go (my spare time) at Google and I've written Scala on LinkedIn. Both are modern languages with best-in-class concurrency features.The following answer is based on my experience of writing large-scale software.Go is a language in which the development pattern is rigidly fixed and compiled into machine code with minimal code amount.Scala is a complex, academic, functional, object-oriented sandbox language that has many features and r

checksumaccumulator { private var sum = 0 = { + = b } = { return ~ (sum 0xFF) + 1 }}Any parameters passed to the method can be used inside the method. An important feature of the method parameters in Scala is that they are all Val, not var. If you want to reassign a parameter to a method, the result is a compilation failure:Scala> def Add (b:byte): Unit = { | // compile however, because B is Val | sum + = b| } a membe

Description, since Spark was written in Scala. Therefore, it is best to use Scala whether you are looking at the source code or writing spark-related codes. Then, as a programmer, the first thing to do is to sharpen the sword in hand. That's creating a code environment for writing Scala. Here because I am personally familiar with eclipse (although I think he is a

Background Notes Recent research spark need Scala to prepare a Scala environment for documenting the configuration notes.The Scala language is based on the Java language, so you have to install the JDK first. Experimental Environment: Win7 under VMware Virtual machine operating system: CentOS 6.5 x64 java:jdk-8u161-linux-x64.tar.gz scala:scala-2.12.4.tgz Install

1. Download1.1Scala DownloadsWindows Edition: http://www.scala-lang.org/download/Linux version: http://www.scala-lang.org/download/2.11.8.htmlPull to the bottom:1.2ScalaIDE Downloads: http://scala-ide.org/download/sdk.htmlinstall Scala under 2.WindowsEnvironment: windows10+jdk1.7+scala2.11.82.1 InstallationHere, change the installation location:Done2.2 Test whether the installation was successfulFirst, set

Classes (Class)A class is a template for an object that, by constructing a class, can declare a series of objects of the same structure using the New keyword. One source file for Scala can contain more than one public class. Declaring the person class: Class person{ var name:string = _ Val Age = 10 Private[this] val gender = "Male" } Description The Name field is assigned the value "_" "_", which is a placeholder. Indicates that name is declared as St

About ScalaScala is a "stretched language", which can be changed and grown with the needs of the user. Scala can be used in a wide range of programming tasks, as small as scripts to build systems. Scala runs on the standard Java platform and can interact seamlessly with all Java libraries. It adds object-oriented and functional programming concepts to statically typed languages .

http://blog.csdn.net/lovehuangjiaju/article/details/47009607 The main contents of this section 1 class definitions, creating objects2 Main constructor3 Auxiliary constructor class definition, creating object Use keyword class to define class person { //class member must initialize, otherwise error //This is defined as a public member var name:string=null }1 2 3 4 5 6 1 2 3 4 5 6 The person class generates a Person.class file after compilingUsing the javap-prviate Person command to view t

Scala List class Faq:how do I create a list in Scala?You can create a Scala List in several different ways, including these approaches: Lisp style Java style Using the List class range method Using the List class fill method Using the List class tabulate method In this Scala List tutorial,

Scala REPLRes1,res2, ... res5 and so on, respectively, indicate the output result. If the result of a computed output is identified as Res2, then the res2 can be used directly in subsequent calls.Cases:Scala Worksheek in the Scala IDEThis is a very useful feature provided by the Scala IDE. Its function is the equivalent of Sc