BAEL-2041 Introduction To Scala
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chandra
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.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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<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>${scala.version}</version>
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</dependency>
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</dependencies>
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<build>
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<sourceDirectory>src/main/scala</sourceDirectory>
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<testSourceDirectory>src/test/scala</testSourceDirectory>
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<plugins>
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<plugin>
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<groupId>net.alchim31.maven</groupId>
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<artifactId>scala-maven-plugin</artifactId>
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<version>3.3.2</version>
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<executions>
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<execution>
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<goals>
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<goal>compile</goal>
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<goal>testCompile</goal>
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</goals>
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<configuration>
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<args>
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<arg>-dependencyfile</arg>
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<arg>${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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</plugins>
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</build>
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<properties>
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<scala.version>2.11.8</scala.version>
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</properties>
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</project>
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package com.baeldung.scala
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class Employee(val name: String, var salary: Int, annualIncrement: Int = 20) extends AnyRef {
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def incrementSalary(): Unit = {
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salary += annualIncrement
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}
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override def toString = s"Employee(name=$name, salary=$salary)"
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}
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package com.baeldung.scala
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object HelloWorld extends App {
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println("Hello World!")
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args foreach println
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}
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package com.baeldung.scala
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object HigherOrderFunctions {
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def mapReduce(r: (Int, Int) => Int, i: Int, m: Int => Int, a: Int, b: Int) = {
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def iter(a: Int, result: Int): Int = {
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if (a > b) result
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else iter(a + 1, r(m(a), result))
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}
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iter(a, i)
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}
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}
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package com.baeldung.scala
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object Utils {
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def average(x: Double, y: Double) = (x + y) / 2
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def gcd(x: Int, y: Int): Int = {
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if (y == 0) x else gcd(y, x % y)
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}
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def gcdIter(x: Int, y: Int): Int = {
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var a = x
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var b = y
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while (b > 0) {
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a = a % b
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val t = a
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a = b
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b = t
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}
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return a
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}
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def rangeSum(a: Int, b: Int) = {
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var sum = 0;
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for (i <- a to b) {
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sum += i
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}
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sum
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}
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def factorial(a: Int): Int = {
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var result = 1;
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var i = a;
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do {
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result *= i
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i = i - 1
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} while (i > 0)
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result
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}
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def randomLessThan(d: Double) = {
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var random = 0d
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do {
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random = Math.random()
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} while (random >= d)
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random
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}
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def whileLoop(condition: => Boolean)(body: => Unit): Unit =
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if (condition) {
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body
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whileLoop(condition)(body)
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}
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def power(x: Int, y: Int): Int = {
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def powNested(i: Int, accumulator: Int): Int = {
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if (i <= 0) accumulator
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else powNested(i - 1, x * accumulator)
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}
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powNested(y, 1)
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}
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def fibonacci(n: Int): Int = n match {
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case 0 | 1 => 1
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case x if x > 1 => fibonacci(x - 1) + fibonacci(x - 2)
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}
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}
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package com.baeldung.scala
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import org.junit.Test
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import org.junit.Assert._
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class EmployeeUnitTest {
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@Test
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def whenEmployeeSalaryIncremented_thenCorrectSalary() = {
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val employee = new Employee("John Doe", 1000);
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employee.incrementSalary();
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assertEquals(1020, employee.salary);
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}
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@Test
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def givenEmployee_whenToStringCalled_thenCorrectStringReturned() = {
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val employee = new Employee("John Doe", 1000);
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assertEquals("Employee(name=John Doe, salary=1000)", employee.toString);
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}
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}
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package com.baeldung.scala
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import org.junit.Test
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import org.junit.Assert._
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import HigherOrderFunctions._
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class HigherOrderFunctionsUnitTest {
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@Test
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def whenCalledWithSumAndSquareFunctions_thenCorrectValueReturned = {
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def square(x: Int) = x * x
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def sum(x: Int, y: Int) = x + y
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def sumSquares(a: Int, b: Int) =
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mapReduce(sum, 0, square, a, b)
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val n = 10
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val expected = n * (n + 1) * (2 * n + 1) / 6
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assertEquals(expected, sumSquares(1, n));
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}
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@Test
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def whenComputingSumOfSquaresWithAnonymousFunctions_thenCorrectValueReturned = {
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def sumSquares(a: Int, b: Int) =
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mapReduce((x, y) => x + y, 0, x => x * x, a, b)
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val n = 10
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val expected = n * (n + 1) * (2 * n + 1) / 6
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assertEquals(expected, sumSquares(1, n));
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}
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@Test
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def givenCurriedFunctions_whenInvoked_thenCorrectValueReturned = {
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def sum(f: Int => Int)(a: Int, b: Int): Int =
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if (a > b) 0 else f(a) + sum(f)(a + 1, b)
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def mod(n: Int)(x: Int) = x % n
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def sumMod5 = sum(mod(5)) _
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assertEquals(10, sumMod5(6,10));
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}
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}
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package com.baeldung.scala
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import org.junit.Test
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import Utils._
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import org.junit.Assert._
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class UtilsUnitTest {
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@Test
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def whenAverageCalled_thenCorrectValueReturned() = {
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val average = Utils.average(10, 20)
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assertEquals(15.0, average, 1e-5)
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}
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@Test
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def givenTwoIntegers_whenGcdCalled_thenCorrectValueReturned = {
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assertEquals(3, Utils.gcd(15, 27))
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}
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@Test
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def givenTwoIntegers_whenGcdIterCalled_thenCorrectValueReturned = {
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assertEquals(3, Utils.gcdIter(15, 27))
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}
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@Test
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def givenTwoIntegers_whenRangeSumcalled_thenCorrectValueReturned = {
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assertEquals(55, Utils.rangeSum(1, 10))
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}
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@Test
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def givenPositiveInteger_whenFactorialInvoked_thenCorrectValueReturned = {
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assertEquals(720, Utils.factorial(6))
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}
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@Test
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def whenRandomLessThanInvokedWithANumber_thenARandomLessThanItReturned = {
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val d = 0.1
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assertTrue(Utils.randomLessThan(d) < d)
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}
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@Test
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def whenPowerInvokedWith2And3_then8Returned = {
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assertEquals(8, power(2, 3))
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}
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@Test
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def whenFibonacciCalled_thenCorrectValueReturned = {
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assertEquals(34, fibonacci(8))
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}
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}
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