URL http://www.scala-lang.org
1) Scala interaction cmd
scala> def isPalindrome(str: String) =
| str == str.reverse.toString()
isPalindrome: (String)Boolean
scala> isPalindrome("mom" )
res1: Boolean = true
scala> isPalindrome("dude" )
res2: Boolean = false
scala>
2) Scala
scala -e "println(\"Hello \"+args(0)+\", \"+args(1))" Buddy "Welcome to Scala"
3) Compile
> scalac Sample.scala
> scala Sample
Hello Scala
> java -classpath /opt/scala/scala-2.7.4.final/lib/scala-library.jar:. Sample
Hello Scala
>
分享到：
相关推荐
2. 函数式编程：Scala支持函数式编程范式，其中函数被当作一等公民（first-class citizens），意味着可以将函数作为参数传递给其他函数，或者作为函数返回值，所有的函数都是对象。 3. 静态类型：Scala是一种静态...
val firstElement = list.head // 结果为 1 ``` #### 21. `def indexOf(elem: A, from: Int): Int` 此方法返回列表中第一个匹配元素的位置，搜索从给定的索引位置开始。 **示例代码：** ```scala val list = List(1...
选择 Scala 的原因包括其表达能力、函数是一等公民（first-class citizen）、闭包支持、简洁性、类型推断、函数创建的语法支持、与 Java 的互操作性等。Scala 编译为 Java 字节码，可以在任何 JVM 上运行，包括 ...
这里的`scala-compile-first`执行阶段确保Scala代码在Java代码之前编译，因为Scala代码可能依赖于Java代码。同时，`scala-maven-plugin`还负责添加Scala源代码目录到构建路径中。 在项目结构上，通常我们会将Java...
The first few chapters will give you enough of the basics that you can already start using Scala for simple tasks. The entire book is organized so that each new concept builds on concepts that came ...
your first on Scala, a foundation on which to build, before you dive into the more advanced features Scala has to offer. I had a great time writing this book and I hope you have a great time learning ...
I’m not sure where I first came across the Scala language. Maybe on a fo- rum for programming language enthusiasts such as Lambda the Ultimate, or maybe in more pedestrian quarters: Reddit, or the ...
Scala 语言 for 循环中的模式匹配 Scala 语言中的 for 循环提供了强大的模式匹配功能，允许开发者在迭代过程中对数据进行模式匹配和过滤。本文将详细介绍 Scala 语言 for 循环中的六种模式匹配方式：变量模式匹配、...
The first part introduces you to Scala, helping you understand the object-oriented and functional programming concepts needed for Spark application development. It then moves on to Spark to cover the ...
安装 首先需要安装好Java和Scala，然后下载Spark安装，确保PATH 和JAVA_HOME 已经设置，然后需要使用Scala的SBT 构建Spark如下： $ sbt/sbt assembly 构建时间比较长。...scala> textFile.first // 打印出第一行
在Scala中，一个函数式编程的核心概念是"头等函数"（first-class functions），即函数可以作为参数传递给其他函数，或者作为结果返回。这种功能在处理高阶函数时非常有用，高阶函数是指那些至少满足下列条件之一的...
for (int pos = iterator.first(); !iterator.isDone(); pos = iterator.next()) { char c = text.charAt(pos); if (isTraditionalChinese(c)) { System.out.println("繁体字: " + c); } else { System.out....
During that first conversation Michael and I dis- cussed the Scala ecosystem and what kind of a book would best serve the community. I believed Scala needed a “practical Scala” book to help guide ...
Scala for Data Science, the first module in this course, is a tutorial guide that provides tutorials on some of the most common Scala libraries for data science, allowing you to quickly get up to ...
First Class Functions Chapter 6. Common Collections Chapter 7. More Collections Part II. Object-Oriented Scala Chapter 8. Classes Chapter 9. Objects, Case Classes and Traits Chapter 10. Advanced ...
The first few chapters will give you enough of the basics that you can already start using Scala for simple tasks. The entire book is organized so that each new concept builds on concepts that came ...
在书的第一部分，"A First Example" 引导读者通过一个简单的程序了解Scala的基本结构。这个例子通常会涵盖变量声明、类型推断以及基本操作，让读者对Scala的编程风格有个初步认识。 接着，"Programming with Actors...
第一个例子 - A First Example #### 2.1 HelloWorld程序 为了快速入门Scala，我们首先来看一个最经典的例子——“Hello World”。虽然这个例子简单至极，但足以让我们初步了解Scala的基本语法。 ```scala object...