From e1aab0a8fb92b17bd22d8345503a2f69dfe33e65 Mon Sep 17 00:00:00 2001
From: Jacob <jacob@katniss.top>
Date: Sat, 23 May 2026 20:49:44 -0400
Subject: [PATCH] feat: get first or last (left) element with data of
 `OneToManyUniqueBTreeMapWithData`

---
 src/one_to_many_with_data.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/one_to_many_with_data.rs b/src/one_to_many_with_data.rs
index c1ee244..2b2b7a0 100644
--- a/src/one_to_many_with_data.rs
+++ b/src/one_to_many_with_data.rs
@@ -40,7 +40,7 @@ where
         old
     }
 
-    pub fn get_rights_for(&self, left: &Left) -> Option<&BTreeMap<Right, RightData>> {
+    pub fn get_rights_and_data_for(&self, left: &Left) -> Option<&BTreeMap<Right, RightData>> {
         self.left_to_rights.get(left)
     }
 
@@ -48,9 +48,17 @@ where
         self.right_to_left.get(right)
     }
 
+    pub fn first_left_and_rights_and_data(&self) -> Option<(&Left, &BTreeMap<Right, RightData>)> {
+        self.left_to_rights.first_key_value()
+    }
+
+    pub fn last_left_and_rights_and_data(&self) -> Option<(&Left, &BTreeMap<Right, RightData>)> {
+        self.left_to_rights.last_key_value()
+    }
+
     pub fn get_left_and_data_for(&self, right: &Right) -> Option<(&Left, &RightData)> {
         let left = self.right_to_left.get(right)?;
-        let rights = self.get_rights_for(left)?;
+        let rights = self.get_rights_and_data_for(left)?;
 
         let right_data = rights.get(right)?;