diff --git a/CHANGELOG.md b/CHANGELOG.md
index a42984f..cae82a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,11 +11,8 @@ All notable changes to this project will be documented in this file.
 ### Changed
 
 - Dependencies updated
-- A few bugfixes
-
-### Added
-
-- Added `SerializationTransform` and `DataclassTransform`
+- Dynamic prefixing is now applied recursively
+- Inline JS functions created using `assign` are now re-used if the code is identical
 
 ## [1.0.3] - 31-07-23
 
diff --git a/dash_extensions/javascript.py b/dash_extensions/javascript.py
index d91b0ab..4c3c648 100644
--- a/dash_extensions/javascript.py
+++ b/dash_extensions/javascript.py
@@ -25,6 +25,11 @@ def __call__(self, var):
         return variable(*all_args)
 
     def add(self, src, name=None):
+        # Check if the function already exists.
+        for key in self.f_map:
+            if name is None and self.f_map[key] == src:
+                return key
+        # Otherwise add it.
         name = f"function{len(self.f_map)}" if name is None else name
         self.f_map[name] = src
         return name