diff --git a/source/mijin/util/string.hpp b/source/mijin/util/string.hpp
index afaa00d..680cb0a 100644
--- a/source/mijin/util/string.hpp
+++ b/source/mijin/util/string.hpp
@@ -8,6 +8,8 @@
 #include <sstream>
 #include <string>
 
+#include "./iterators.hpp"
+
 namespace mijin
 {
 
@@ -28,7 +30,7 @@ namespace mijin
 //
 
 template <typename TRange, typename TValue = typename TRange::value_type>
-std::string join(const TRange& elements, const char* const delimiter)
+[[nodiscard]] std::string join(const TRange& elements, const char* const delimiter)
 {
     std::ostringstream oss;
     auto first = std::begin(elements);
@@ -47,6 +49,25 @@ std::string join(const TRange& elements, const char* const delimiter)
     return oss.str();
 }
 
+template<typename TChar, typename TTraitsA, typename TTraitsB>
+[[nodiscard]] bool equalsIgnoreCase(std::basic_string_view<TChar, TTraitsA> stringA, std::basic_string_view<TChar, TTraitsB> stringB) noexcept
+{
+    if (stringA.size() != stringB.size())
+    {
+        return false;
+    }
+
+    for (const auto [charA, charB] : zip(stringA, stringB))
+    {
+        if (std::tolower(charA) != std::tolower(charB))
+        {
+            return false;
+        }
+    }
+
+    return true;
+}
+
 namespace pipe
 {
 struct Join
@@ -62,7 +83,6 @@ auto operator|(TIterable&& iterable, const Join& joiner)
     return join(std::forward<TIterable>(iterable), joiner.delimiter);
 }
 }
-
 } // namespace mijin
 
 #endif // !defined(MIJIN_UTIL_STRING_HPP_INCLUDED)