diff --git a/source/mijin/container/optional.hpp b/source/mijin/container/optional.hpp
index 80f1fac..6411773 100644
--- a/source/mijin/container/optional.hpp
+++ b/source/mijin/container/optional.hpp
@@ -156,6 +156,14 @@ public:
 public:
     [[nodiscard]] inline std::remove_reference_t<TValue>& get() noexcept;
     [[nodiscard]] inline const std::remove_reference_t<TValue>& get() const noexcept;
+    template<typename TDefault>
+    [[nodiscard]] inline std::remove_reference_t<TValue> getOr(TDefault&& defaultValue) const& MIJIN_NOEXCEPT_IF((std::is_nothrow_constructible_v<TValue, TDefault&&> && std::is_nothrow_copy_constructible_v<TValue>));
+    template<typename TDefault>
+    [[nodiscard]] inline std::remove_reference_t<TValue> getOr(TDefault&& defaultValue) && MIJIN_NOEXCEPT_IF((std::is_nothrow_constructible_v<TValue, TDefault&&> && std::is_nothrow_move_constructible_v<TValue>));
+    template<typename TException, typename... TArgs>
+    [[nodiscard]] inline std::remove_reference_t<TValue> getOrThrow(TArgs&&... args) const&;
+    template<typename TException, typename... TArgs>
+    [[nodiscard]] inline std::remove_reference_t<TValue> getOrThrow(TArgs&&... args) &&;
     [[nodiscard]] constexpr bool empty() const noexcept { return storage_.empty(); }
     inline void reset() noexcept;
 
@@ -350,6 +358,46 @@ inline const std::remove_reference_t<TValue>& Optional<TValue>::get() const noex
     return storage_.get();
 }
 
+template<typename TValue>
+template<typename TDefault>
+std::remove_reference_t<TValue> Optional<TValue>::getOr(TDefault&& defaultValue) const& MIJIN_NOEXCEPT_IF((std::is_nothrow_constructible_v<TValue, TDefault&&> && std::is_nothrow_copy_constructible_v<TValue>))
+{
+    if (!empty()) {
+        return get();
+    }
+    return TValue(std::forward<TDefault>(defaultValue));
+}
+
+template<typename TValue>
+template<typename TDefault>
+std::remove_reference_t<TValue> Optional<TValue>::getOr(TDefault&& defaultValue) && MIJIN_NOEXCEPT_IF((std::is_nothrow_constructible_v<TValue, TDefault&&> && std::is_nothrow_move_constructible_v<TValue>))
+{
+    if (!empty()) {
+        return std::move(get());
+    }
+    return TValue(std::forward<TDefault>(defaultValue));
+}
+
+template<typename TValue>
+template<typename TException, typename... TArgs>
+std::remove_reference_t<TValue> Optional<TValue>::getOrThrow(TArgs&&... args) const&
+{
+    if (!empty()) {
+        return get();
+    }
+    throw TException(std::forward<TArgs>(args)...);
+}
+
+template<typename TValue>
+template<typename TException, typename... TArgs>
+std::remove_reference_t<TValue> Optional<TValue>::getOrThrow(TArgs&&... args) &&
+{
+    if (!empty()) {
+        return std::move(get());
+    }
+    throw TException(std::forward<TArgs>(args)...);
+}
+
 template<typename TValue>
 inline void Optional<TValue>::reset() noexcept
 {