diff --git a/courses/.idea/modules/courses-build.iml b/courses/.idea/modules/courses-build.iml
index 432ef16..d87c23a 100644
--- a/courses/.idea/modules/courses-build.iml
+++ b/courses/.idea/modules/courses-build.iml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="courses-build" external.linked.project.path="$MODULE_DIR$/../../project" external.root.project.path="$MODULE_DIR$/../.." external.system.id="SBT" sbt.imports="_root_.sbt.plugins.IvyPlugin, _root_.sbt.plugins.JvmPlugin, _root_.sbt.plugins.CorePlugin, _root_.sbt.plugins.JUnitXmlReportPlugin, _root_.sbt.plugins.Giter8TemplatePlugin, sbt._, Keys._, dsl._" sbt.resolvers="https://repo1.maven.org/maven2/|maven|public, C:\Users\jll\.ivy2\cache|ivy|Local cache" type="SBT_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="false">
+<module external.linked.project.id="courses-build" external.linked.project.path="$MODULE_DIR$/../../project" external.root.project.path="$MODULE_DIR$/../.." external.system.id="SBT" sbt.imports="_root_.sbt.plugins.IvyPlugin, _root_.sbt.plugins.JvmPlugin, _root_.sbt.plugins.CorePlugin, _root_.sbt.plugins.JUnitXmlReportPlugin, _root_.sbt.plugins.Giter8TemplatePlugin, sbt._, Keys._, dsl._" sbt.resolvers="https://repo1.maven.org/maven2/|maven|public, C:\Users\jleng\.ivy2\cache|ivy|Local cache" type="SBT_MODULE" version="4">
+  <component name="NewModuleRootManager">
     <output url="file://$MODULE_DIR$/../../project/target/idea-classes" />
     <output-test url="file://$MODULE_DIR$/../../project/target/idea-test-classes" />
     <exclude-output />
diff --git a/courses/.idea/modules/courses.iml b/courses/.idea/modules/courses.iml
index b7ffbe4..e4124d5 100644
--- a/courses/.idea/modules/courses.iml
+++ b/courses/.idea/modules/courses.iml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module external.linked.project.id="courses" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="SBT" type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8" inherit-compiler-output="false">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
     <output url="file://$MODULE_DIR$/../../target/scala-2.11/classes" />
     <output-test url="file://$MODULE_DIR$/../../target/scala-2.11/test-classes" />
     <exclude-output />
diff --git a/courses/src/main/scala/week5/reduction.sc b/courses/src/main/scala/week5/reduction.sc
new file mode 100644
index 0000000..83f9781
--- /dev/null
+++ b/courses/src/main/scala/week5/reduction.sc
@@ -0,0 +1,10 @@
+def mapFun[T, U](xs: List[T], f: T => U): List[U] =
+  (xs foldRight List[U]())( (a, b) => f(a) :: b )
+
+def lengthFun[T](xs: List[T]): Int =
+  (xs foldRight 0)( (a, b) => b + 1)
+
+
+
+lengthFun(List(3, 4, 5, 6))
+mapFun(List(3, 4, 5, 6), (x => 1)) // Couldn't find how to try it out
\ No newline at end of file