programming in scala

This article compares the keywords of Java and ScalaJava keywords Java has a total of 50Keywords(Keywords), Two of which areReserved Words, Not used yet:GotoAndConst.True,FalseAndNullIt looks like a keyword, but it's actually justLiteral. This article roughly regards true, false, and null as Java keywords and considers Java as a total of 53 keywords. Below is a list of roughly classified Java keywords: Assert Boolean, byte, short, Char, Int, long, float, double, void Package, import, class,

Scala basic Concept +ideRecommended: "Scala Programming"1 Basic ConceptsIn spark development, Scala is considered to be the best-compatible language for current and spark. Scala run on a standard Java platform that can be used with Java seamless interaction.

To simplify the installation of Hadoop and Spark, write this today.First of all, to see how many machines on hand, to install pseudo-distributed hadoop+spark or fully distributed, here are recorded separately.1. Pseudo-Distributed installationPseudo-distributed Hadoop is the Namenode,secondarynamenode,datanode and so on a machine to execute, spark the same, generally used in the development environment.1.1 Preparatory workSystem Preparation: A Ubuntu16.04 machine, preferably connected to the Int

PS: The contents of this article are mainly from the notes of Brother Ningshi.1, download scala.tgz. Note. msi is a program under Windows and cannot be opened in Linux.Http://www.scala-lang.org/download/2.11.6.html inside can be downloaded. Down, you can see the tgz format.2. Create and copy to the Usr/scala folder.In Linux Desktop Edition can not knock command. Open the computer directly, it contains all the folders under Linux.3, unzip the folder.Wh

A few days ago, Lao Zhao published two articles: in. NET platform using the Scala language (top): first taste and use Scala language on the. NET platform (bottom): Analytics.After I read it, I was interested in the Scala language. So I started trying.Installing the Scala SDK on the Ubuntu 9.10 operating system is a ver

0. Scala introduction (pronounced /? SK certificate? L ?, ? Ske? L? /) Is a multi-paradigm programming language designed to integrate various features of object-oriented programming and functional programming. Scala runs on the Java platform (Java Virtual Machine) and is compatible with existing Java programs. Scala compilation model (independent compilation and

Scala Interpreter To start the scala interpreter, follow these steps: ● Install Scala. ● Make sure that the scala/bin directory is in the system path. ● Open the command line window in your operating system. ● Type Scala and press Enter. Tip: Do you prefer command line? You

Because Scala has a more complete Eclipse IDE (Scala IDE for Eclipse), it's easy, fast, and convenient for Dev who doesn't want to migrate from Eclipse to the IEA platform. It is particularly important to compile and package the development of Scala applications under Eclipse. SBT is a build tool similar to MAVEN, which we will use to build the publishing program

comparison of concurrent implementations of Scala and Golang Concurrency language is the need of large-scale application of architecture, and has its real needs. Before and after learning about Scala and Golang, we deeply appreciate the great differences in style and philosophy between the modern concurrency language and the old Java and C + + languages. This article is mainly for

methods for traversing collections 1. Iterating through a collection with a foreach Loop foreach receives a function as a parameter. The defined function should receive an element as an input parameter, and then do not return anything. The type of the input parameter should match the type in the collection. With the execution of foreach, it passes an element to your function every time, until the last element in the collection. The most common use of foreach is output information:

Short form of function text Scala provides a number of ways to remove redundant information and write the function text more briefly. Pay attention to these opportunities because they allow you to get rid of the clutter in your code. One way to make the text of a function shorter is to remove the parameter type. Therefore, the previous example with a filter can be written like this: scala>　someNumbers.fi

Fuzzy concept list method and function covariant and contravariant lambda trait and Interface Curry Extractor object case-defined class-biased function implicit conversion and implicit parameter call-by namecall-by value Fuzzy Concept list First record, follow-up after the focus of the breach method and function covariant and inverse lambda what exactly is the difference between trait and interface currying (currying) Extractor object implicit conversion and implicit argument case definition cla

I. Basics 1. VariablesVal identifier: Declares constants. For example, Val answer = 1.VaR flag: declares a variable; Type inference: Scala deduce the type of a variable based on the expression of the initialization variable; Val is encouraged; Note: An error is reported if the variable is declared without initialization. Explicit type: Scala variables or functions are always written after variables or

This article is mainly about Scala concurrent (parallel) programming, then why the topic is called Geotrellis use (vi), mainly because this series explains how to use Geotrellis, the specific previous several blog has been introduced. I think the basis of doing any one thing is very important, like the college entrance examination or a variety of examinations, teachers will emphasize the basis, which is very reasonable. The basics of using the Geotrel

First lesson: Getting Started with ScalaThe great value of 1:scala2:scala basic function Getting started combat3:scala function Getting Started combatArray,map,tuple Combat in 4:scala5: Comprehensive case and spark source code analysisThe relationship between Scala and Java:One: They're all JVM-based, but Scala can inv

Knowledge Points: 1. Conditional expression if (x>0) 1 Else 0 Scala each expression has a type, if it is the same type, and if it is a mixed-type expression, the public superclass of any.if (x>0) 1 may not have output values, in Scala, each expression should have some value, introducing the Unit class, writing (). if (x>0) 1 is equivalent to if (x>0) 1 else () 2. Statement termination, if you write a long s

Use of 1.Scala ReplInstall Scala and append the bin directory of the Scala installation directory to the PATH environment variable. In this case, you can enter Scala directly under CMD to enter REPLEnter REPL, and you can enter a valid expression in Scala after the command p

Scala Featured Tutorials-case class and pattern matching Scala Featured Tutorials-case class and pattern matching (1): A simple Demo sample Scala Featured Tutorials-case class and pattern matching (2): type of pattern (i) Scala Featured Tutorials-case class and pattern matching (3): type of pattern (ii)

The first step is to build the Scala development environment and find tutorials on the web.declaring constants and variablesval foo = 0 //constant var bar = 0 //variable　　In Scala, it is more encouraged to declare using Val, which is the recommended constant. Most of the time do not need a semicolon, look at their own good ... Although it is a strongly static type of language, it does not write the type-t

Historically, the Java™ platform has been the domain of object-oriented programming, but now even staunch supporters of the Java language are starting to notice a new trend in application development: Functional programming. In this new series, Ted Neward introduces Scala, a programming language that combines functions and object-oriented technology with the JVM. In this article, Ted will give you an example of why you should take the time to learn ab