Kotlin3 Homework Functions Козеева Ксения

src/main/kotlin/ru/otus/homework/functions.kt

@@ -27,6 +27,18 @@ fun main() {
 
     val product = 2 by 2
     println("Произведение: $product")
+
+    //Homework---
+    val f1result = function1(2, 3, 5, 2)
+    println(f1result)
+
+    val f2result = function2("Hello", "World", "Nice", "Day", char1 = '/')
+    println(f2result)
+
+    val list = arrayListOf<String>("Hello", "Good Morning", "Good Evening", "Good Day", "Good Night", "How are you?")
+    val f3result = function3('e', list, ::function4)
+    println(f3result)
+
 }
 
 infix fun Int.by(other: Int): Int = this * other

src/main/kotlin/ru/otus/homework/homework.kt

@@ -0,0 +1,41 @@
+package ru.otus.homework
+
+import kotlin.system.measureTimeMillis
+
+
+fun function1(int1: Int, int2: Int, vararg n: Int): Int {
+    var sum = int1 + int2
+
+    if (!n.isEmpty()) n.forEach { sum += it } else throw IllegalArgumentException()
+
+    return sum
+}
+
+fun function2(vararg s: String, char1: Char = ' '): String {
+    val sb = StringBuilder()
+
+    s.forEach { string -> sb.append(string).append(char1) }
+
+    return sb.toString()
+}
+
+fun function3(char: Char, list: ArrayList<String>, f: (Char, ArrayList<String>) -> List<String>): String {
+
+    val duration = measureTimeMillis {
+        f(char, list)
+    }
+
+    return ("Время выполнения = ${duration / 1000} секунд")
+}
+
+fun function4(char: Char, list: ArrayList<String>): List<String> {
+
+    val newArray = mutableListOf<String>()
+
+    list.forEach { string ->
+        if (string.contains(char)) newArray.add(string)
+        Thread.sleep(2000)
+    }
+
+    return newArray
+}

src/test/kotlin/ru/otus/homework/FunctionsTest.kt

@@ -1,6 +1,7 @@
 package ru.otus.homework
 
 import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 
 class FunctionsTest {
@@ -11,4 +12,10 @@ class FunctionsTest {
             calculate(1, 2)
         )
     }
+
+    @Test
+    fun testFunction2(){
+        val expected = "Hello/World/Nice/Day/"
+        assertEquals(expected, function2("Hello", "World", "Nice", "Day", char1 = '/'))
+    }
 }