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Swapan Pramanick
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core-scala: initial commit
1 parent e35e842 commit d468734

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‎core-scala/build.gradle‎

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apply plugin: 'scala'
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repositories {
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mavenCentral()
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}
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dependencies {
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compile 'org.scala-lang:scala-library:2.12.6'
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testCompile 'org.scalatest:scalatest_2.12:3.0.5'
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testCompile 'junit:junit:4.12'
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}
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‎core-scala/build.sbt‎

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import Dependencies._
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lazy val root = (project in file(".")).
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settings(
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inThisBuild(List(
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organization := "com.example",
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scalaVersion := "2.12.6",
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version := "0.1.0-SNAPSHOT"
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)),
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name := "core-scala",
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libraryDependencies += scalaTest % Test
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)

‎core-scala/pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-scala</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<properties>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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<encoding>UTF-8</encoding>
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<scala.version>2.12.6</scala.version>
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<scala.compat.version>2.12</scala.compat.version>
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<spec2.version>4.2.0</spec2.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.scala-lang</groupId>
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<artifactId>scala-library</artifactId>
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<version>${scala.version}</version>
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</dependency>
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<!-- Test -->
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.scalatest</groupId>
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<artifactId>scalatest_${scala.compat.version}</artifactId>
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<version>3.0.5</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.specs2</groupId>
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<artifactId>specs2-core_${scala.compat.version}</artifactId>
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<version>${spec2.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.specs2</groupId>
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<artifactId>specs2-junit_${scala.compat.version}</artifactId>
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<version>${spec2.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<sourceDirectory>src/main/scala</sourceDirectory>
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<testSourceDirectory>src/test/scala</testSourceDirectory>
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<plugins>
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<plugin>
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<!-- see http://davidb.github.com/scala-maven-plugin -->
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<groupId>net.alchim31.maven</groupId>
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<artifactId>scala-maven-plugin</artifactId>
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<version>3.3.2</version>
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<executions>
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<execution>
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<goals>
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<goal>compile</goal>
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<goal>testCompile</goal>
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</goals>
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<configuration>
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<args>
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<arg>-dependencyfile</arg>
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<arg>${project.build.directory}/.scala_dependencies</arg>
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</args>
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</configuration>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.21.0</version>
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<configuration>
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<!-- Tests will be run with scalatest-maven-plugin instead -->
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<skipTests>true</skipTests>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.scalatest</groupId>
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<artifactId>scalatest-maven-plugin</artifactId>
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<version>2.0.0</version>
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<configuration>
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<reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
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<junitxml>.</junitxml>
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<filereports>TestSuiteReport.txt</filereports>
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<!-- Comma separated list of JUnit test class names to execute -->
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<jUnitClasses>samples.AppTest</jUnitClasses>
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</configuration>
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<executions>
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<execution>
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<id>test</id>
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<goals>
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<goal>test</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

‎core-scala/project/Dependencies.scala‎

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import sbt._
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object Dependencies {
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lazy val scalaTest = "org.scalatest" %% "scalatest" % "3.0.5"
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}

‎core-scala/project/build.properties‎

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sbt.version=1.1.6

‎core-scala/src/main/scala/com/baeldung/examples/ClassExamples.scala‎

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package com.baeldung.examples
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object ClassExamples extends App {
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import java.time._
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class Customer(val id:Int, val name:String, dob:LocalDate) {
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private var _age = calculateAge(dob)
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def age = _age // getter
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def age_= (age:Int) = _age = age //setter
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private def calculateAge(dob:LocalDate) = Period
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.between(dob, LocalDate.now)
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.getYears
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//override def toString: String = s"(id:${id}, name:${name}, age:${age})"
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}
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val c = new Customer(1, "Varun Sharma", LocalDate.parse("1980-02-27"))
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println(c)
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case class Address(addressLn1:String, area:String, city:String, zip:String)
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val address=Address("102, Raycon Lotus Apartment", "AECS Layout", "Bangalore", "560037")
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val anotherAddress = address.copy(addressLn1="41/2, ITPL Road")
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println(address)
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println(anotherAddress)
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}

‎core-scala/src/main/scala/com/baeldung/examples/CollectionExamples.scala‎

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package com.baeldung.examples
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object CollectionExamples extends App {
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val aList = List(5, 3, 9, 2) // create a list
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val sortedAscList = aList.sorted // sort ascending
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val sortedDescList = aList.sortWith(_ > _) // sort descending
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val evenList = aList.filter(_%2 == 0) // filter on some condition
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val mySet = Set(10, 20, 5) // create a set
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val changedSet = mySet + 50 // add an element
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println(changedSet)
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val changedSet2 = mySet - 20 // remove an element
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println(changedSet2)
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val capitals = Map("Japan" -> "Tokyo",
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"England" -> "London",
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"India" -> "New Delhi") // create a map
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val capitalOfJapan = capitals("Japan") // get from map
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println(capitalOfJapan)
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}

‎core-scala/src/main/scala/com/baeldung/examples/ExceptionHandlingExamples.scala‎

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package com.baeldung.examples
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object ExceptionHandlingExamples extends App {
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import java.io._
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def printLines(filename:String) = {
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var reader:Option[BufferedReader] = None
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try {
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reader = Some(new BufferedReader(new FileReader(new File(filename))))
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reader.get.lines().forEach(println(_))
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} catch {
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case e:FileNotFoundException => println(s"There was no file named ${filename}")
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case e:Throwable => throw new Exception("Some error occurred", e)
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} finally {
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if (reader.isDefined) reader.get.close()
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}
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}
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printLines("test.txt")
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}

‎core-scala/src/main/scala/com/baeldung/examples/FirstClassFunctionExamples.scala‎

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package com.baeldung.examples
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object FirstClassFunctionExamples extends App {
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def sum(x:Double, y:Double, f:Double => Double) = f(x) + f(y)
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println(sum(3, 4, x => x*x)) // returns 25.0
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println(sum(3, 4, x => x*x*x)) // returns 91.0
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println(sum(3, 4, Math.pow(_, 2))) // returns 25.0
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def max(first:Int, second:Int) = if (first > second) first else second
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println(max(10, -2))
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}

‎core-scala/src/main/scala/com/baeldung/examples/LoopAndCalculationExamples.scala‎

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package com.baeldung.examples
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object LoopAndCalculationExamples extends App {
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import CalculationUtils._
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println(sumWithWhile(Array(10, 20, 30)))
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println(sumWithFor(Array(10, 20, 30)))
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println(checkEvenOdd((1 to 10).toArray).toList)
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println(filterEvens((1 to 10).toArray).toList)
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}
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object CalculationUtils {
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def sumWithWhile(values:Array[Int]) = {
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var sum = 0
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var i = 0
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while ( i < values.length) {
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sum += values(i)
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i+=1
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}
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sum
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}
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def sumWithFor(values:Array[Int]) = {
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var sum = 0
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for (i <- values) {
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sum += i
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}
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sum
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}
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def checkEvenOdd(values:Array[Int]) = {
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for (i <- values) yield if (i%2 == 0) "Even" else "Odd"
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}
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def filterEvens(values:Array[Int]) =
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for (i <- values if i%2 == 0)
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yield i
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}

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