diff --git a/examples/example.sh b/examples/example.sh
index 10e8b0e..80cb792 100755
--- a/examples/example.sh
+++ b/examples/example.sh
@@ -117,4 +117,43 @@ echo 0 | cat - <(curl -s https://raw.githubusercontent.com/ssledz/bash-fun/v1.1.
     map lambda a . 'list $a' | foldl lambda acc el . 'echo $(($acc + 1))'
 
 echo 0 | cat - <(curl -s curl -s https://raw.githubusercontent.com/ssledz/bash-fun/v1.1.1/src/fun.sh) \
-            | foldl lambda acc el . 'echo $(($acc + 1))'
\ No newline at end of file
+            | foldl lambda acc el . 'echo $(($acc + 1))'
+
+
+factorial() {
+    fact_iter() {
+        local product=$1
+        local counter=$2
+        local max_count=$3
+        if [[ $counter -gt $max_count ]]; then
+            echo $product
+        else
+            fact_iter $(echo $counter\*$product | bc) $(($counter + 1)) $max_count
+        fi
+    }
+
+    fact_iter 1 1 $1
+}
+
+factorial_trampoline() {
+    fact_iter() {
+        local product=$1
+        local counter=$2
+        local max_count=$3
+        if [[ $counter -gt $max_count ]]; then
+            res $product
+        else
+            call fact_iter $(echo $counter\*$product | bc) $(($counter + 1)) $max_count
+        fi
+    }
+
+    with_trampoline fact_iter 1 1 $1
+}
+
+echo Factorial test
+
+time factorial 30
+time factorial_trampoline 30
+
+time factorial 60
+time factorial_trampoline 60
\ No newline at end of file
diff --git a/src/fun.sh b/src/fun.sh
index e3d0ba5..07da0a7 100755
--- a/src/fun.sh
+++ b/src/fun.sh
@@ -242,7 +242,7 @@ zip() {
   done
 }
 
-function curry() {
+curry() {
   exportfun=$1; shift
   fun=$1; shift
   params=$*
@@ -253,3 +253,25 @@ function curry() {
   eval $cmd
 }
 
+with_trampoline() {
+  local f=$1; shift
+  local args=$@
+  while [[ $f != 'None' ]]; do
+    ret=$($f $args)
+#    echo $ret
+    f=$(tupl $ret)
+    args=$(echo $ret | tupx 2- | tr ',' ' ')
+  done
+  echo $args
+}
+
+res() {
+    local value=$1
+    tup "None" $value
+}
+
+call() {
+    local f=$1; shift
+    local args=$@
+    tup $f $args
+}