coursera scala

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/ ing/tuples I. Array 1. Fixed Length Array Two forms of declaring an array: Declare the Val array name of the specified length = new array [type] (array length) 　　 Provides an array of initial values without the new keyword. 　　 Scala declares an array with an array class name and uses () to specify the length or provide an initial value sequence. In JVM, scala array is implemented in Java array

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

Reprinted from Http://www.tuicool.com/articles/jYzuAv and http://www.importnew.com/1537.htmlIn a keynote speech that I collaborated with Martin Fowler, he made an insightful point:The legacy of Java will be the platform, not the programming language.The original engineers of Java technology made a wise decision to separate the programming language from the runtime environment, which ultimately enabled more than 200 languages to run on the Java platform. This architecture is critical to the long-

01. Introduction and installation of Scala 1.1 Scala introductionScala is the Java language scripting, the feature is that the Java language is not scripted to use the script, so that it has a simple script language, WYSIWYG features, and high programming efficiency, fast implementation and other characteristics. In the big Data world, the famous frameworks for Spark and Kafka are written in the

Functional Object Advantages and disadvantages of immutable object Adv 1. Immutable objects are more likely to be inferred because they do not change values over time. Adv 2. immutable objects can be automatically transmitted without changes. To transfer a mutable object, you must first back up the mutable object to prevent modification to the object state in other processes. Adv 3. The thread cannot change the state of an immutable object (corruption, corruption). It is destined to be thread-sa

1.scala InterpreterThe installation process is similar to a JDK installation, you need to install the JDK first, and then download and install Scala to configure the PATH environment variable.2. Run cmd in the win environment using WIN+R, bring up the command window, execute the callout command①scala Support TAB Command Auto-completion②

As we all know, Scala is a functional programming language of the Geek type, and the features supported include: The function has a "class citizen" status; Support for anonymous functions (volume of function numbers) Supports higher order functions Support closures Partial application functions Currying The first point to note is that there are two forms of methods and function objects in

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