diff --git a/src/lib.zig b/src/lib.zig
index 95bfa98a0a7e5de3102db1ee7e1ca0049a9a65ad..ed633a9548649c6fbf09b4418375cab670bd03c7 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -642,3 +642,11 @@ pub fn coalescePartial(comptime T: type, into: T, from: Partial(T)) T {
     }
     return temp;
 }
+
+pub fn joinPartial(comptime P: type, a: P, b: P) P {
+    var temp = a;
+    inline for (comptime std.meta.fieldNames(P)) |name| {
+        if (@field(b, name)) |val| @field(temp, name) = val;
+    }
+    return temp;
+}