diff --git a/27-functions-advanced/05-higher-order-funcs/main.go b/27-functions-advanced/05-higher-order-funcs/main.go
index 277e483..ef5da4c 100644
--- a/27-functions-advanced/05-higher-order-funcs/main.go
+++ b/27-functions-advanced/05-higher-order-funcs/main.go
@@ -25,45 +25,6 @@ func main() {
 	fmt.Printf("> 6        : %d\n", filter(greater(6), nums...))
 	fmt.Printf("<= 6       : %d\n", filter(lesseq(6), nums...))
 	fmt.Printf("<= 6       : %d\n", filter(reverse(greater(6)), nums...))
-
-	fmt.Println("\n••• CLOSURES •••")
-	fmt.Printf("uniques    : %d\n", filter(uniques(), 1, 1, 2, 3, 3))
-
-	dups := reverse(uniques())
-	fmt.Printf("dups       : %v\n", filter(dups, 1, 1, 2, 3, 3))
-
-	dups = reverse(uniques())
-	fmt.Printf("dups dups  : %v\n", filter(dups, 1, 1, 2, 3, 3, 3, 3))
-
-	dups = reverse(uniques())
-	out := filter(dups, 1, 1, 2, 3, 3, 3, 3)
-	fmt.Printf("dups uniqs : %v\n", filter(uniques(), out...))
-
-	dups = reverse(uniques())
-	chained := chain(reverse(greater(1)), dups, uniques())
-	fmt.Printf("dups chain : %v\n", filter(chained, 1, 1, 2, 3, 3, 3, 3, 0, 0))
-}
-
-func chain(filters ...filterFunc) filterFunc {
-	return func(n int) bool {
-		for _, next := range filters {
-			if !next(n) {
-				return false
-			}
-		}
-		return true
-	}
-}
-
-func uniques() filterFunc {
-	seen := make(map[int]bool)
-
-	return func(n int) (ok bool) {
-		if !seen[n] {
-			seen[n], ok = true, true
-		}
-		return
-	}
 }
 
 func reverse(f filterFunc) filterFunc {
diff --git a/27-functions-advanced/06-functional-programming/main.go b/27-functions-advanced/06-functional-programming/main.go
new file mode 100644
index 0000000..277e483
--- /dev/null
+++ b/27-functions-advanced/06-functional-programming/main.go
@@ -0,0 +1,97 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+)
+
+type filterFunc func(int) bool
+
+func main() {
+	fmt.Println("••• HIGHER-ORDER FUNCS •••")
+
+	nums := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
+
+	odd := reverse(reverse(isEven))
+	fmt.Printf("reversed   : %t\n", odd(8))
+
+	fmt.Printf("> 3        : %d\n", filter(greater(3), nums...))
+	fmt.Printf("> 6        : %d\n", filter(greater(6), nums...))
+	fmt.Printf("<= 6       : %d\n", filter(lesseq(6), nums...))
+	fmt.Printf("<= 6       : %d\n", filter(reverse(greater(6)), nums...))
+
+	fmt.Println("\n••• CLOSURES •••")
+	fmt.Printf("uniques    : %d\n", filter(uniques(), 1, 1, 2, 3, 3))
+
+	dups := reverse(uniques())
+	fmt.Printf("dups       : %v\n", filter(dups, 1, 1, 2, 3, 3))
+
+	dups = reverse(uniques())
+	fmt.Printf("dups dups  : %v\n", filter(dups, 1, 1, 2, 3, 3, 3, 3))
+
+	dups = reverse(uniques())
+	out := filter(dups, 1, 1, 2, 3, 3, 3, 3)
+	fmt.Printf("dups uniqs : %v\n", filter(uniques(), out...))
+
+	dups = reverse(uniques())
+	chained := chain(reverse(greater(1)), dups, uniques())
+	fmt.Printf("dups chain : %v\n", filter(chained, 1, 1, 2, 3, 3, 3, 3, 0, 0))
+}
+
+func chain(filters ...filterFunc) filterFunc {
+	return func(n int) bool {
+		for _, next := range filters {
+			if !next(n) {
+				return false
+			}
+		}
+		return true
+	}
+}
+
+func uniques() filterFunc {
+	seen := make(map[int]bool)
+
+	return func(n int) (ok bool) {
+		if !seen[n] {
+			seen[n], ok = true, true
+		}
+		return
+	}
+}
+
+func reverse(f filterFunc) filterFunc {
+	return func(n int) bool {
+		return !f(n)
+	}
+}
+
+func greater(min int) filterFunc {
+	return func(n int) bool {
+		return n > min
+	}
+}
+
+func lesseq(max int) filterFunc {
+	return func(n int) bool {
+		return n <= max
+	}
+}
+
+func filter(f filterFunc, nums ...int) (filtered []int) {
+	for _, n := range nums {
+		if f(n) {
+			filtered = append(filtered, n)
+		}
+	}
+	return
+}
+
+func isEven(n int) bool { return n%2 == 0 }
+func isOdd(m int) bool  { return m%2 == 1 }
diff --git a/27-functions-advanced/07-deferred-funcs-todo/TODO.md b/27-functions-advanced/07-deferred-funcs-todo/TODO.md
new file mode 100644
index 0000000..f87f5c1
--- /dev/null
+++ b/27-functions-advanced/07-deferred-funcs-todo/TODO.md
@@ -0,0 +1 @@
+# TODO
\ No newline at end of file
diff --git a/27-functions-advanced/08-panic-recover-todo/TODO.md b/27-functions-advanced/08-panic-recover-todo/TODO.md
new file mode 100644
index 0000000..f87f5c1
--- /dev/null
+++ b/27-functions-advanced/08-panic-recover-todo/TODO.md
@@ -0,0 +1 @@
+# TODO
\ No newline at end of file