diff --git a/Cargo.toml b/Cargo.toml
index b063356..17d64d2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "grapherity"
-version = "0.2.1"
+version = "0.2.2"
 authors = ["Stefan Müller"]
 edition = "2024"
 rust-version = "1.85.0"
diff --git a/src/algorithms.rs b/src/algorithms.rs
index 730ed4c..b974441 100644
--- a/src/algorithms.rs
+++ b/src/algorithms.rs
@@ -122,12 +122,12 @@ where
     G: GraphTopology,
 {
     let mut predecessors = graph.vertex_map(None);
-    let (distances, _) = bfs_impl(graph, source, |neighbor, predecessor| {
+    let result = bfs_impl(graph, source, |neighbor, predecessor| {
         predecessors[neighbor] = Some(predecessor);
         true
     });
     BfsResult {
-        distances,
+        distances: result.distances,
         predecessors,
     }
 }
@@ -136,7 +136,7 @@ pub fn bfs_distances<G>(graph: &G, source: G::Vertex) -> VertexMap<G::Vertex, Op
 where
     G: GraphTopology,
 {
-    bfs_impl(graph, source, |_, _| true).0
+    bfs_impl(graph, source, |_, _| true).distances
 }
 
 pub fn bfs_find<G>(graph: &G, source: G::Vertex, target: G::Vertex) -> Option<u32>
@@ -154,14 +154,15 @@ where
     if predicate(source) {
         return Some((source, 0));
     }
-    bfs_impl(graph, source, |neighbor, _| !predicate(neighbor)).1
+    bfs_impl(graph, source, |neighbor, _| !predicate(neighbor)).found
 }
 
-fn bfs_impl<G, F>(
-    graph: &G,
-    source: G::Vertex,
-    mut on_discover: F,
-) -> (VertexMap<G::Vertex, Option<u32>>, Option<(G::Vertex, u32)>)
+struct BfsImplResult<V: Copy> {
+    distances: VertexMap<V, Option<u32>>,
+    found: Option<(V, u32)>,
+}
+
+fn bfs_impl<G, F>(graph: &G, source: G::Vertex, mut on_discover: F) -> BfsImplResult<G::Vertex>
 where
     G: GraphTopology,
     F: FnMut(G::Vertex, G::Vertex) -> bool,
@@ -178,13 +179,19 @@ where
                 let distance = distances[v].unwrap() + 1;
                 distances[neighbor] = Some(distance);
                 if !on_discover(neighbor, v) {
-                    return (distances, Some((neighbor, distance)));
+                    return BfsImplResult {
+                        distances,
+                        found: Some((neighbor, distance)),
+                    };
                 }
                 queue.push_back(neighbor);
             }
         }
     }
-    (distances, None)
+    BfsImplResult {
+        distances,
+        found: None,
+    }
 }
 
 pub struct DfsResult<V: Copy> {
@@ -197,12 +204,12 @@ where
     G: GraphTopology,
 {
     let mut predecessors = graph.vertex_map(None);
-    let (visited, _) = dfs_impl(graph, source, |neighbor, predecessor| {
+    let result = dfs_impl(graph, source, |neighbor, predecessor| {
         predecessors[neighbor] = Some(predecessor);
         true
     });
     DfsResult {
-        visited,
+        visited: result.visited,
         predecessors,
     }
 }
@@ -211,7 +218,7 @@ pub fn dfs_visited<G>(graph: &G, source: G::Vertex) -> VertexMap<G::Vertex, bool
 where
     G: GraphTopology,
 {
-    dfs_impl(graph, source, |_, _| true).0
+    dfs_impl(graph, source, |_, _| true).visited
 }
 
 pub fn dfs_find<G>(graph: &G, source: G::Vertex, target: G::Vertex) -> bool
@@ -229,14 +236,15 @@ where
     if predicate(source) {
         return Some(source);
     }
-    dfs_impl(graph, source, |neighbor, _| !predicate(neighbor)).1
+    dfs_impl(graph, source, |neighbor, _| !predicate(neighbor)).found
 }
 
-fn dfs_impl<G, F>(
-    graph: &G,
-    source: G::Vertex,
-    mut on_discover: F,
-) -> (VertexMap<G::Vertex, bool>, Option<G::Vertex>)
+struct DfsImplResult<V: Copy> {
+    visited: VertexMap<V, bool>,
+    found: Option<V>,
+}
+
+fn dfs_impl<G, F>(graph: &G, source: G::Vertex, mut on_discover: F) -> DfsImplResult<G::Vertex>
 where
     G: GraphTopology,
     F: FnMut(G::Vertex, G::Vertex) -> bool,
@@ -248,7 +256,10 @@ where
     while let Some((v, predecessor)) = stack.pop() {
         if let Some(p) = predecessor {
             if !on_discover(v, p) {
-                return (visited, Some(v));
+                return DfsImplResult {
+                    visited,
+                    found: Some(v),
+                };
             }
         }
         for neighbor in graph.adjacent_vertices(v) {
@@ -258,7 +269,10 @@ where
             }
         }
     }
-    (visited, None)
+    DfsImplResult {
+        visited,
+        found: None,
+    }
 }
 
 pub fn dfs_find_path<G>(graph: &G, source: G::Vertex, target: G::Vertex) -> Option<Vec<G::Edge>>
diff --git a/src/maps.rs b/src/maps.rs
index b7c24ef..1bda1a1 100644
--- a/src/maps.rs
+++ b/src/maps.rs
@@ -13,11 +13,17 @@ impl<V: Copy, T: Clone> VertexMap<V, T> {
         }
     }
 
-    // Reads beyond len() are valid and return the default value.
-    pub fn len(&self) -> usize {
-        self.inner.len()
+    // Reads beyond 'capacity' are valid and return the default value.
+    pub fn capacity(&self) -> usize {
+        self.inner.capacity()
     }
 
+    #[deprecated(since = "0.2.2", note = "use 'capacity' instead")]
+    pub fn len(&self) -> usize {
+        self.capacity()
+    }
+
+
     pub fn sync<G: GraphTopology<Vertex = V>>(&mut self, graph: &G) {
         self.inner.resize(graph.vertex_capacity());
     }
@@ -48,9 +54,14 @@ impl<E: Copy, T: Clone> EdgeMap<E, T> {
         }
     }
 
-    // Reads beyond len() are valid and return the default value.
+    // Reads beyond 'capacity' are valid and return the default value.
+    pub fn capacity(&self) -> usize {
+        self.inner.capacity()
+    }
+
+    #[deprecated(since = "0.2.2", note = "use 'capacity' instead")]
     pub fn len(&self) -> usize {
-        self.inner.len()
+        self.capacity()
     }
 
     pub fn sync<G: GraphTopology<Edge = E>>(&mut self, graph: &G) {
@@ -87,7 +98,7 @@ impl<E: Copy, T: Clone> EntityMap<E, T> {
         }
     }
 
-    pub fn len(&self) -> usize {
+    pub fn capacity(&self) -> usize {
         self.data.len()
     }
 
diff --git a/src/testing/maps_testing.rs b/src/testing/maps_testing.rs
index 202b2db..e8b5362 100644
--- a/src/testing/maps_testing.rs
+++ b/src/testing/maps_testing.rs
@@ -53,16 +53,16 @@ macro_rules! vertex_map_tests {
             let mut graph = <$T>::new();
             graph.add_vertex();
             let mut map = graph.vertex_map(42);
-            let initial_len = map.len();
-            while graph.vertex_capacity() <= initial_len {
+            let capacity_before = map.capacity();
+            while graph.vertex_capacity() <= capacity_before {
                 graph.add_vertex();
             }
             assert!(
-                map.len() < graph.vertex_capacity(),
+                map.capacity() < graph.vertex_capacity(),
                 "precondition: map is stale before sync"
             );
             map.sync(&graph);
-            assert_eq!(map.len(), graph.vertex_capacity());
+            assert_eq!(map.capacity(), graph.vertex_capacity());
         }
 
         #[test]
@@ -109,7 +109,7 @@ macro_rules! vertex_map_deletion_tests {
             let capacity_before = graph.vertex_capacity();
             graph.delete_vertex(v2);
             map.sync(&graph);
-            assert_eq!(map.len(), capacity_before);
+            assert_eq!(map.capacity(), capacity_before);
             assert_eq!(map[v1], 5);
         }
 
@@ -197,16 +197,16 @@ macro_rules! edge_map_tests {
             let v2 = graph.add_vertex();
             graph.add_edge(v1, v2);
             let mut map = graph.edge_map(42);
-            let initial_len = map.len();
-            while graph.edge_capacity() <= initial_len {
+            let capacity_before = map.capacity();
+            while graph.edge_capacity() <= capacity_before {
                 graph.add_edge(v1, v2);
             }
             assert!(
-                map.len() < graph.edge_capacity(),
+                map.capacity() < graph.edge_capacity(),
                 "precondition: map is stale before sync"
             );
             map.sync(&graph);
-            assert_eq!(map.len(), graph.edge_capacity());
+            assert_eq!(map.capacity(), graph.edge_capacity());
         }
 
         #[test]
@@ -259,7 +259,7 @@ macro_rules! edge_map_deletion_tests {
             let capacity_before = graph.edge_capacity();
             graph.delete_edge(e2);
             map.sync(&graph);
-            assert_eq!(map.len(), capacity_before);
+            assert_eq!(map.capacity(), capacity_before);
             assert_eq!(map[e1], 5);
         }