diff --git a/linera-core/src/data_types.rs b/linera-core/src/data_types.rs
index 8eb09385389..3708f3a73c0 100644
--- a/linera-core/src/data_types.rs
+++ b/linera-core/src/data_types.rs
@@ -204,7 +204,7 @@ impl CrossChainRequest {
             CrossChainRequest::UpdateRecipient { height_map, .. } => {
                 height_map.iter().any(|(_, heights)| {
                     debug_assert!(heights.windows(2).all(|w| w[0] <= w[1]));
-                    matches!(heights.get(0), Some(h) if *h <= height)
+                    matches!(heights.first(), Some(h) if *h <= height)
                 })
             }
             _ => false,
diff --git a/linera-explorer/src/lib.rs b/linera-explorer/src/lib.rs
index 8815f311145..9503d9d63de 100644
--- a/linera-explorer/src/lib.rs
+++ b/linera-explorer/src/lib.rs
@@ -278,7 +278,7 @@ async fn chains(app: &JsValue, node: &str) -> Result<ChainId> {
         .serialize(&SER)
         .expect("failed to serialize ChainIds");
     setf(app, "chains", &chains_js);
-    Ok(chains.default.unwrap_or_else(|| match chains.list.get(0) {
+    Ok(chains.default.unwrap_or_else(|| match chains.list.first() {
         None => ChainId::from(ChainDescription::Root(0)),
         Some(chain_id) => *chain_id,
     }))
diff --git a/linera-views-derive/src/lib.rs b/linera-views-derive/src/lib.rs
index 06e23e52551..7c65d840e4d 100644
--- a/linera-views-derive/src/lib.rs
+++ b/linera-views-derive/src/lib.rs
@@ -73,7 +73,7 @@ fn context_and_constraints(
         context = Type::Path(TypePath {
             qself: None,
             path: template_vect
-                .get(0)
+                .first()
                 .expect("failed to find the first generic parameter")
                 .clone()
                 .into(),
@@ -126,7 +126,7 @@ fn generate_view_code(input: ItemStruct, root: bool) -> TokenStream2 {
         clear_quotes.push(quote! { self.#name.clear(); });
     }
     let first_name_quote = name_quotes
-        .get(0)
+        .first()
         .expect("list of names should be non-empty");
 
     let increment_counter = if root {
diff --git a/linera-views/src/queue_view.rs b/linera-views/src/queue_view.rs
index 1d5e87d58bd..0e48ae8e3b1 100644
--- a/linera-views/src/queue_view.rs
+++ b/linera-views/src/queue_view.rs
@@ -295,8 +295,7 @@ where
         if count == 0 {
             return Ok(Vec::new());
         }
-        let mut values = Vec::new();
-        values.reserve(count);
+        let mut values = Vec::with_capacity(count);
         if !self.was_cleared {
             let stored_remainder = self.stored_count();
             let start = self.stored_indices.end - stored_remainder;
@@ -336,8 +335,7 @@ where
         if count == 0 {
             return Ok(Vec::new());
         }
-        let mut values = Vec::new();
-        values.reserve(count);
+        let mut values = Vec::with_capacity(count);
         let new_back_len = self.new_back_values.len();
         if count <= new_back_len || self.was_cleared {
             values.extend(
diff --git a/linera-views/tests/views_tests.rs b/linera-views/tests/views_tests.rs
index d34d9b954f8..848f679fa62 100644
--- a/linera-views/tests/views_tests.rs
+++ b/linera-views/tests/views_tests.rs
@@ -1041,9 +1041,9 @@ async fn compute_hash_view_iter<R: RngCore>(rng: &mut R, n: usize, k: usize) {
             .push(compute_hash_ordered_view(rng, &mut store3, key_value_vector.clone()).await);
     }
     for i in 1..n_iter {
-        assert_eq!(unord1_hashes.get(0).unwrap(), unord1_hashes.get(i).unwrap());
-        assert_eq!(unord2_hashes.get(0).unwrap(), unord2_hashes.get(i).unwrap());
-        assert_eq!(ord_hashes.get(0).unwrap(), ord_hashes.get(i).unwrap());
+        assert_eq!(unord1_hashes.first().unwrap(), unord1_hashes.get(i).unwrap());
+        assert_eq!(unord2_hashes.first().unwrap(), unord2_hashes.get(i).unwrap());
+        assert_eq!(ord_hashes.first().unwrap(), ord_hashes.get(i).unwrap());
     }
 }