From 7b7bf727da3250907284368b98b0083a4b4e2386 Mon Sep 17 00:00:00 2001
From: mryouse
Date: Sat, 3 Jun 2023 20:22:18 +0000
Subject: initial commit

---
 p99/p21.neb | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 p99/p21.neb

(limited to 'p99/p21.neb')

diff --git a/p99/p21.neb b/p99/p21.neb
new file mode 100644
index 0000000..8b465e9
--- /dev/null
+++ b/p99/p21.neb
@@ -0,0 +1,16 @@
+; P21 Insert an element at a given position into a list
+
+(def a (list "a" "b" "c" "d"))
+
+(func extend (lst1 lst2)
+    (reduce append lst2 lst1))
+
+(func insert-at (item lst idx)
+    (extend
+        (slice lst 1 (- idx 1))
+        (prepend (slice lst idx) item)))
+            ;(slice lst idx)
+            ;(append (slice lst 1 (- idx 1)) item)))
+
+(print (->string a))
+(print (->string (insert-at "f" a 2)))
-- 
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