diff --git a/lib/glacier/container/vector.h b/lib/glacier/container/vector.h
index 64e11b8..eafeb78 100644
--- a/lib/glacier/container/vector.h
+++ b/lib/glacier/container/vector.h
@@ -37,6 +37,7 @@ class Vector {
 
   // Setters.
   // FIXME: Handle downsizing.
+  // TODO: Rename this so it is clear that this only affects capacity.
   void Resize(uint64_t capacity);
 
   void PushBack(const T& item);
diff --git a/lib/mammoth/file/file.cpp b/lib/mammoth/file/file.cpp
index 7d2a9a7..b1c4e74 100644
--- a/lib/mammoth/file/file.cpp
+++ b/lib/mammoth/file/file.cpp
@@ -72,8 +72,8 @@ glcr::ErrorOr<glcr::Vector<glcr::String>> ListDirectory(glcr::StringView path) {
 
   auto file_views = glcr::StrSplit(dir.filenames(), ',');
   glcr::Vector<glcr::String> files;
-  for (uint64_t i = 0; i < file_views.size(); i++) {
-    files.PushBack(file_views[i]);
+  for (const auto& view : glcr::StrSplit(dir.filenames(), ',')) {
+    files.PushBack(view);
   }
   return files;
 }
diff --git a/sys/denali/denali_server.cpp b/sys/denali/denali_server.cpp
index ef6d9d4..ba99e3e 100644
--- a/sys/denali/denali_server.cpp
+++ b/sys/denali/denali_server.cpp
@@ -39,8 +39,8 @@ glcr::Status DenaliServer::HandleReadMany(const ReadManyRequest& req,
   }
 
   uint64_t sector_cnt = 0;
-  for (uint64_t i = 0; i < req.sector_cnt().size(); i++) {
-    sector_cnt += req.sector_cnt().at(i);
+  for (uint64_t cnt : req.sector_cnt()) {
+    sector_cnt += cnt;
   }
   uint64_t region_paddr;
   mmth::OwnedMemoryRegion region = mmth::OwnedMemoryRegion::ContiguousPhysical(
diff --git a/sys/teton/terminal.cpp b/sys/teton/terminal.cpp
index c4d14c9..9adb28d 100644
--- a/sys/teton/terminal.cpp
+++ b/sys/teton/terminal.cpp
@@ -55,9 +55,8 @@ void Terminal::ExecuteCommand(const glcr::String& command) {
     if (!files_or.ok()) {
       console_.WriteString(glcr::StrFormat("Error: {}\n", files_or.error()));
     } else {
-      auto& files = files_or.value();
-      for (uint64_t i = 0; i < files.size(); i++) {
-        console_.WriteString(files[i]);
+      for (const auto& file : files_or.value()) {
+        console_.WriteString(file);
         console_.WriteChar('\n');
       }
     }
diff --git a/sys/victoriafalls/victoriafalls_server.cpp b/sys/victoriafalls/victoriafalls_server.cpp
index fbc5e42..c48be7b 100644
--- a/sys/victoriafalls/victoriafalls_server.cpp
+++ b/sys/victoriafalls/victoriafalls_server.cpp
@@ -94,8 +94,8 @@ glcr::Status VFSServer::HandleGetDirectory(const GetDirectoryRequest& request,
   }
 
   glcr::VariableStringBuilder filelist;
-  for (uint64_t i = 0; i < files.size(); i++) {
-    filelist.PushBack(glcr::StringView(files.at(i).name, files.at(i).name_len));
+  for (const DirEntry& file : files) {
+    filelist.PushBack(glcr::StringView(file.name, file.name_len));
     filelist.PushBack(',');
   }
   // Remove trailing comma.
diff --git a/sys/yellowstone/yellowstone.cpp b/sys/yellowstone/yellowstone.cpp
index ced7332..5efc089 100644
--- a/sys/yellowstone/yellowstone.cpp
+++ b/sys/yellowstone/yellowstone.cpp
@@ -47,10 +47,9 @@ uint64_t main(uint64_t port_cap) {
   glcr::Vector<glcr::StringView> files =
       glcr::StrSplit(init_file.as_str(), '\n');
 
-  for (uint64_t i = 0; i < files.size(); i++) {
-    if (!files[i].empty()) {
-      mmth::File binary =
-          mmth::File::Open(glcr::StrFormat("/bin/{}", files[i]));
+  for (glcr::StringView& file : files) {
+    if (!file.empty()) {
+      mmth::File binary = mmth::File::Open(glcr::StrFormat("/bin/{}", file));
 
       ASSIGN_OR_RETURN(client_cap, server->CreateClientCap());
       auto error_or = mmth::SpawnProcessFromElfRegion(
diff --git a/zion/object/process.cpp b/zion/object/process.cpp
index 8f45086..6fde4f1 100644
--- a/zion/object/process.cpp
+++ b/zion/object/process.cpp
@@ -65,9 +65,9 @@ void Process::Exit(uint64_t exit_code) {
   state_ = CLEANUP;
   exit_code_ = exit_code;
 
-  for (uint64_t i = 0; i < threads_.size(); i++) {
-    if (!threads_[i]->IsDying()) {
-      threads_[i]->SetState(Thread::CLEANUP);
+  for (const auto& t : threads_) {
+    if (!t->IsDying()) {
+      t->SetState(Thread::CLEANUP);
     }
   }
 
@@ -93,9 +93,9 @@ void Process::Cleanup() {
   }
 
   // 1. For each thread, call cleanup.
-  for (uint64_t i = 0; i < threads_.size(); i++) {
-    if (threads_[i]->GetState() == Thread::CLEANUP) {
-      threads_[i]->Cleanup();
+  for (const auto& t : threads_) {
+    if (t->GetState() == Thread::CLEANUP) {
+      t->Cleanup();
     }
   }