diff --git a/.idea/misc.xml b/.idea/misc.xml
index 03f397c..10a22f9 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_19" default="true" project-jdk-name="19" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_23" default="true" project-jdk-name="19" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/Main.kt b/src/Main.kt
index a7a5e00..9a12a47 100644
--- a/src/Main.kt
+++ b/src/Main.kt
@@ -1,3 +1,39 @@
 fun main() {
-    println("Hello World!")
-}
\ No newline at end of file
+    // Part 1
+    val numbers = (1..10).toList()
+    val numbersDoubled = numbers.map {it * 2}
+    println(numbersDoubled)
+    // Part 2
+    val names = listOf("Alice", "Bob", "Amir", "Charlie", "Annie", "David")
+    val namesStartingWithA = filterNames(names) {it.startsWith("A")}
+    println(namesStartingWithA)
+    // Part 3
+    val words = listOf("apple", "banana", "kiwi", "strawberry", "grape")
+    val sortedWordsDescending = {listOfWords: List<String> -> listOfWords.sortedByDescending { it.length }}
+    println(sortedWordsDescending(words))
+    // Part 4
+    println(customFilter(numbers){ it > 5 })
+    println(customFilter(numbers){ it % 2 == 0 })
+    println(customFilter(numbers){ it % 3 == 0 })
+    // Part 5
+    println(processNumbers(numbers))
+    // Bonus
+    val processedNumbers_Bonus = processNumbers_Bonus(numbers, { it % 2 != 0 })  { it * it}
+    println(processedNumbers_Bonus)
+}
+// For Part 2
+fun filterNames(names: List<String>, filterByFirstLetter: (String) -> Boolean): List<String>{
+    return names.filter(filterByFirstLetter)
+}
+// For Part 4
+fun customFilter(numbers: List<Int>, filter: (Int) -> Boolean): List<Int>{
+    return numbers.filter(filter)
+}
+// Part 5
+fun processNumbers(numbers: List<Int>): List<Int>{
+    return numbers.filter { it % 2 != 0 }.map { it * it }
+}
+// Bonus
+fun processNumbers_Bonus(numbers: List<Int>, filterEvenNumbers: (Int) -> Boolean, squareNumbers: (Int) -> Int): List<Int>{
+    return numbers.filter(filterEvenNumbers).map(squareNumbers)
+}