[Scala-61] implicit classes

scala-core-2/src/main/scala/com/baeldung/scala/implicitclasses/Currency.scala

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+package com.baeldung.scala.implicitclasses
+
+sealed trait Currency
+object Currency {
+ case object EUR extends Currency
+ case object USD extends Currency
+ case object GBP extends Currency
+}

scala-core-2/src/main/scala/com/baeldung/scala/implicitclasses/Money.scala

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+package com.baeldung.scala.implicitclasses
+
+case class Money(amount: Double, currency: Currency)

scala-core-2/src/main/scala/com/baeldung/scala/implicitclasses/MoneySyntax.scala

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+package com.baeldung.scala.implicitclasses
+
+object MoneySyntax {
+ implicit class RichMoney(val amount: Double) extends AnyVal {
+ def euros: Money = Money(amount, Currency.EUR)
+ def dollars: Money = Money(amount, Currency.USD)
+ def pounds: Money = Money(amount, Currency.GBP)
+ }
+}

scala-core-2/src/test/scala/com/baeldung/scala/implicitclasses/MoneyTest.scala

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+package com.baeldung.scala.implicitclasses
+
+import org.scalatest.{Matchers, WordSpec}
+
+class MoneyTest extends WordSpec with Matchers {
+ val amount: Double = 30.5
+
+ "MoneySyntax" should {
+ import MoneySyntax._
+ "create dollars" in {
+ amount.dollars shouldBe Money(amount, Currency.USD)
+ }
+ "create euros" in {
+ amount.euros shouldBe Money(amount, Currency.EUR)
+ }
+ "create pounds" in {
+ amount.pounds shouldBe Money(amount, Currency.GBP)
+ }
+ }
+}