From 835b66e70812db023dcb9c66cf4027f573ceaaac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jakob=20R=C3=B6nnb=C3=A4ck?= <jakob@rowanbrook.net>
Date: Thu, 5 Feb 2026 11:13:41 +0100
Subject: [PATCH] Step 5: Page 30

---
 src/main.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 3809671..ccbbe24 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -49,6 +49,12 @@ impl TodoList {
             Ok(TodoList::new())
         }
     }
+
+    fn save_to_file(&self, filename: &str) -> Result<(), Box<dyn std::error::Error>> {
+        let json = serde_json::to_string_pretty(self)?;
+        fs::write(filename, json)?;
+        Ok(())
+    }
 }
 fn main() {
     let cli = Cli::parse();