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
deleted file mode 100644
index a7a5e00..0000000
--- a/src/Main.kt
+++ /dev/null
@@ -1,3 +0,0 @@
-fun main() {
-    println("Hello World!")
-}
\ No newline at end of file
diff --git a/src/part1.kt b/src/part1.kt
new file mode 100644
index 0000000..e8ce629
--- /dev/null
+++ b/src/part1.kt
@@ -0,0 +1,7 @@
+
+fun main() {
+    println(
+        (1..10).toList().map { it * 2 }
+    )
+}
+
diff --git a/src/part2.kt b/src/part2.kt
new file mode 100644
index 0000000..03f8dba
--- /dev/null
+++ b/src/part2.kt
@@ -0,0 +1,11 @@
+fun main() {
+    val namesList = listOf("Alice", "Bob", "Amir", "Charlie", "Annie", "David");
+
+    println(filterNames(namesList, startsWithA ))
+}
+
+fun filterNames(textList: List<String>, callBack: (String) -> Boolean): List<String> {
+    return textList.filter(callBack);
+}
+
+val startsWithA: (String) -> Boolean = { text -> text.startsWith('A')}
\ No newline at end of file
diff --git a/src/part3.kt b/src/part3.kt
new file mode 100644
index 0000000..bfb6af8
--- /dev/null
+++ b/src/part3.kt
@@ -0,0 +1,6 @@
+fun main() {
+    val wordsList = listOf("apple", "banana", "kiwi", "strawberry", "grape");
+    val sortedWordsList = wordsList.sortedByDescending { it.length };
+
+    println(sortedWordsList);
+}
\ No newline at end of file
diff --git a/src/part4.kt b/src/part4.kt
new file mode 100644
index 0000000..226c033
--- /dev/null
+++ b/src/part4.kt
@@ -0,0 +1,13 @@
+fun main() {
+    val greaterThan5 = customFilter(listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) { it > 5 }
+    val evenNumbers = customFilter(listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) { it % 2 == 0 }
+    val multiplesOf3 = customFilter(listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) { it % 3 == 0 }
+
+    println(greaterThan5);
+    println(evenNumbers);
+    println(multiplesOf3);
+}
+
+fun customFilter(numbers: List<Int>, filter: (Int) -> Boolean): List<Int> {
+    return numbers.filter(filter);
+}
\ No newline at end of file
diff --git a/src/part5.kt b/src/part5.kt
new file mode 100644
index 0000000..be4fa5b
--- /dev/null
+++ b/src/part5.kt
@@ -0,0 +1,16 @@
+fun main() {
+    val numbers = listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
+    val oddNumbersSquared = processNumbers(
+        numbers, condition = { it % 2 != 0 }, transform = { it * it }
+    )
+
+    println(oddNumbersSquared)
+}
+
+fun processNumbers(
+    numbers: List<Int>,
+    condition: (Int) -> Boolean,
+    transform: (Int) -> Int
+): List<Int> {
+    return numbers.filter(condition).map(transform)
+}
\ No newline at end of file