esperimenti funzionali e non con Kotlin

.idea/compiler.xml

@@ -10,10 +10,12 @@
         <module name="modernjava" />
         <module name="scala" />
         <module name="modern-java" />
+        <module name="functional-kotlin" />
       </profile>
     </annotationProcessing>
     <bytecodeTargetLevel>
       <module name="fpgym" target="8" />
+      <module name="functional-kotlin" target="8" />
       <module name="functional-programming-java" target="8" />
       <module name="modern-java" target="9" />
       <module name="modernjava" target="9" />

.idea/kotlinc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Kotlin2JvmCompilerArguments">
+    <option name="jvmTarget" value="1.8" />
+  </component>
+</project>

README.md

@@ -1,2 +1,2 @@
-# fpgym
+If MyDate were not a Comparable, and you omitted the operator modifier, comparing two dates via <, >, <=, or >= would not compile.# fpgym
 Functional Programming Gym

functional-kotlin/pom.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<artifactId>functional-kotlin</artifactId>
+
+	<parent>
+		<artifactId>fpgym</artifactId>
+		<groupId>org.gym.fp</groupId>
+		<version>1.0</version>
+	</parent>
+</project>

functional-kotlin/src/main/java/KotlinTest.kt

@@ -0,0 +1,54 @@
+import java.time.LocalDate
+
+
+data class Person(val name: String,
+                  val lastname: String,
+                  val birthday: LocalDate)
+
+typealias Function<T, R> = (T) -> R
+
+typealias BiFunction<T, U, R> = (T, U) -> R
+
+inline class Amount(val quantity: Int)
+
+inline class Weight(val quantity: Int)
+
+inline class Password(val value: String)
+
+class UInt(val value: Int) {
+  init {
+    require(value >= 0)
+  }
+}
+
+fun add(a: Int, b: Int): Int = a + b
+
+fun main() {
+  val (a, _) = Pair(1, 2)
+  println(a)
+
+  val fabio = Person("Fabio", "Scotto", LocalDate.of(1988, 2, 17))
+  val (name, lastname, _) = fabio
+  println("${name}, ${lastname}")
+
+  when(fabio.name) {
+    "Fabio" -> println(fabio.name)
+  }
+
+  each(UInt(5)) {
+    println("Hello")
+  }
+
+}
+
+operator fun Int.compareTo(other: UInt): Int {
+  return this.compareTo(other.value)
+}
+
+fun each(times: UInt, block: () -> Unit) {
+  var i = 0
+  while(i <= times) {
+    block()
+    i++
+  }
+}