diff --git a/src/clj/com/rpl/specter/navs.cljc b/src/clj/com/rpl/specter/navs.cljc
index a587402..3cd1084 100644
--- a/src/clj/com/rpl/specter/navs.cljc
+++ b/src/clj/com/rpl/specter/navs.cljc
@@ -95,6 +95,13 @@
       (comp (map next-fn)
             (filter not-NONE?))
       structure))
+  
+  #?(:clj String :cljs string)
+  (all-transform [structure next-fn]
+    (apply str (into []
+                     (comp (map next-fn)
+                           (filter not-NONE?))
+                     structure)))
 
   #?(:clj clojure.lang.PersistentHashSet :cljs cljs.core/PersistentHashSet)
   (all-transform [structure next-fn]
diff --git a/test/com/rpl/specter/core_test.cljc b/test/com/rpl/specter/core_test.cljc
index 1ba123c..8323b4f 100644
--- a/test/com/rpl/specter/core_test.cljc
+++ b/test/com/rpl/specter/core_test.cljc
@@ -1440,6 +1440,15 @@
   (is (= "abq" (setval s/LAST "q" "abc")))
   )
 
+(defn whitespace? [char]
+  (re-matches #"\s" (str char)))
+
+(deftest string-transform-test
+  (is (= "123" (transform s/ALL identity "123")))
+  (is (= "123" (transform [s/ALL whitespace?] s/NONE "1 2 3")))
+  #?(:clj (is (= "123" (setval [s/ALL #(Character/isWhitespace %)] s/NONE "1 2 3"))))
+  #?(:clj (is (= "123" (transform [(s/filterer #(Character/isWhitespace %))] s/NONE "1 2 3")))))
+
 (deftest regex-navigation-test
   ;; also test regexes as implicit navs
   (is (= (select #"t" "test") ["t" "t"]))