emelent · September 13, 2022 10:00 · Sep 13, 2022
diff --git a/interfacesSample.kt b/interfacesSample.kt
@@ -0,0 +1,73 @@
+interface Donkey {
+    fun speak(speech: String)
+}
+
+fun interface ISpeechDevice {
+    operator fun invoke(speech: String)
+}
+
+class PrintDevice: ISpeechDevice {
+    override fun invoke(speech: String) {
+        println(speech)
+    }
+}
+
+class TextFileDevice: ISpeechDevice {
+    override fun invoke(speech: String) {
+        println("Writing '$speech' to some file...")
+    }
+}
+
+class RealDonkey(private val device: ISpeechDevice) : Donkey {
+    override fun speak(speech: String) {
+        device(speech)
+    }
+}
+
+class Person(
+    val name: String,
+    val age: Int
+) {
+
+    operator fun plus(p2: Person): Person {
+        return Person(
+            name = name + p2.name,
+            age = age + p2.age
+        )
+    }
+
+    operator fun plus(i: Int): Person {
+        return Person(
+            name = name,
+            age = age + i
+        )
+    }
+
+    fun intro() {
+        println("Hi I'm $name and I'm $age years old.")
+    }
+}
+
+fun people() {
+    val p1 = Person("Jake", 20)
+    val p2 = Person("Simon", 30)
+
+    p1.intro() // Jake 20
+    p2.intro() // Simon 30
+    (p1 + 10).intro() // Jake 30
+    (p1 + p2).intro() // JakeSimon 50
+}
+
+fun speakingDevices() {
+    val pDevice = PrintDevice()
+    val tDevice = TextFileDevice()
+    val d1 = RealDonkey(pDevice)
+    val d2 = RealDonkey(tDevice)
+    val d3 = RealDonkey{
+        println("THe magic device says: $it")
+    }
+}
+
+fun main() {
+
+}