Added a get function to IndexMap

src/lib.rs

@@ -62,6 +62,14 @@ where
         Self(HashMap::new())
     }
 
+    pub fn get<Q: ?Sized>(&self, k: &Q) -> Option<Index>
+    where
+        K: Borrow<Q>,
+        Q: Hash + Eq + ToOwned<Owned = K>,
+    {
+        self.0.get(k).cloned()
+    }
+
     pub fn get_or_create<Q: ?Sized>(&mut self, k: &Q) -> Index
     where
         K: Borrow<Q>,