A systematic study of Scala has recently begun. In fact, I used Scala before, for example, when I was using Gatling's performance testing tool, I was exposed to Scala. Gatling itself is written in Scala, and the Gatling performance Test profile itself is a Scala class that i
The main contents of this section
Introduction to Scala I/O operations
Scala Writing Files
Scala Read files
Scala Network I/O
Introduction to Regular expressions
Scala regular-expression combat
1. Introduction to
ArrayLike an array of Java, it is also an immutable arrays, and since both Scala and Java are running in the JVM, both sides can call each other, so the bottom of the Scala array is actually a Java array.
Note: Accessing an array of elements using () instead of [] in Java
Scala>ValA =NewArray[string] (Ten) a:array[string] = Array (NULL,NULL,NULL,NUL
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
Match use case class:
Case classes is used for pattern matching and case expression to specify the class. These are standard classes with special modifications: case. The following is a simple pattern that uses case class matching examples:
Object Test {
def main (args:array[string]) {
Val alice = new Person ("Alice", 25)
Val bob = new Person ("Bob", 32)
Val charlie = new Person ("Charlie", 32)
for (Person
Person Match {
Case person ("Alice") => println ("Hi alice!")
Case person ("Bob
A concise course in Scala
Directory
Variable declaration
Function
Package Package
Data
String
Control process
Pattern matching
Object-oriented
Generic type
Annotations
Implicit
Empty Object Nil,null,null,unit,nothing,none
Scala is a multiple-paradigm (MULTI-PARADIGM) programming language.
Scala source code is compiled into Java bytecode, so it can run on top
Class and constructors:The class is defined as follows:
Class MyClass (A:int, b:int) {
println (a.tostring)
}
In Scala, classes can also have class parameters, class parameters can be used directly in the body of the class, there is no need to define a field and then assign the constructor parameters to the field, but it should be noted that: the class parameter is just a parameter, not a field, if you need to use elsewhere, you must define the f
Goal one: In-depth understanding of higher order functions Higher order functions1.1 ConceptsScala mixes object-oriented and functional features,We usually use an expression that can be passed as a parameter to a method called a function.In functional programming languages, functions are "prime citizens",Higher-order functions include: functions as Values , anonymous functions , closures , currying , and so on. 1.2 function as a value (hence the n
There are many similarities between Scala and Java, but there are many differences. This is primarily a Java developer's perspective, summarizing some of the thinking changes that are faced in the process of using Scala. Here is just a summary of the two languages in the development process of the different, will be updated after some switching in the development process is worth noting. The following is a
Summary: When it comes to dealing with large-scale data, R, Python, Scala, and Java basically meet your requirements.
There is a big data project, you know the problem area (problem domain), you know what infrastructure to use, and maybe even decide which framework to use to process all of this data, but one decision has been delayed: which language should I choose? (or perhaps more specifically, the question is, what language should I force all
Guide to Scala development by chszs. Blog homepage: http://blog.csdn.net/chszs、下scala Scala
The latest version of Scala is 2.10.2. There are two release packages for Windows:
1) Windows (ZIP Archive) scala-2.10.2.zip
Windows (MSI) scala
to elements in a tuple.The type parameter in the TUPLE4 definition is preceded by a + sign, which represents the Covarience parameter and will be explained in depth later2. Set has two types, immutable and mutable, with the same name, creating immutable set objects by default650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/55/46/wKiom1SJYMeBdQOaAAF8Nvro-Is758.jpg "title=" 2014-12-11 17_15_07-programming in
Prerequisite
In this article, we'll create a mobile application that runs on an Android device. You will need to install the Android SDK; This article uses the V1.5 SDK. Application code will be written in the Scala programming language. If you've never used Scala, then it doesn't matter, because this article will explain the Scala code. However, even if you are
Seventh step: Parameterized array with typeYou can instantiate an object or class instance using new in Scala. When you instantiate an object in Scala, you can parameterize it with values and types: parameterize. Parameterization means "set" it when you create an instance. Parameterize an instance with a value by passing the object in parentheses to the constructor of the instance. For example, the followin
There is a big data project, you know the problem area (problem domain), you know what infrastructure to use, and maybe even decide which framework to use to process all of this data, but one decision has been delayed: which language should I choose? (or perhaps more specifically, the question is, what language should I force all my developers and data scientists to use?) The question will not be postponed for too long, but will be decided sooner or later.Of course, nothing prevents you from usi
To the Scala website, download the Scala SDK, address: http://www.scala-lang.org/download/ademacbook-pro:scala-2.11. 6 apple$ wget http://downloads.typesafe.com/scala/2.11.6/scala-2.11.6.tgz?_ga= 1.266727886.1594027332.1432723613Unzip and configure:ademacbook-pro:scala-2.11. 6 apple$ tar-zxvf
Scala Eclipse SBT Application developmentGeneral steps for building eclipse to develop Scala applicationsFirst, the Environment preparation:1, scala:http://www.scala-lang.org/2. Scala IDE for eclipse:scala-ide.org3, sbt:http://www.scala-sbt.org/4. SBT Eclipse:https://github.com/typesafehub/sbteclipse typesafe an SBT for Eclipse helper that can help build eclipse5
The relationship between Scala and Java, I think, can begin with a sentence: Scala comes from Java, but it's higher than Java.Scala's designer Martin Odersky is a Java control, the man who designed the Javac and wrote the common code in the JDK. It can be said that the Java language itself is Martin Odersky one step at a glance to grow up. So Scala can say that i
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
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