diff --git a/examples/simple/src/simple/core.cljs b/examples/simple/src/simple/core.cljs
index cd656a5..a6da9bd 100644
--- a/examples/simple/src/simple/core.cljs
+++ b/examples/simple/src/simple/core.cljs
@@ -1,6 +1,7 @@
 (ns simple.core
   (:require [reagent.core :as reagent]
-            [re-frame.core :as rf]))
+            [re-frame.core :as rf]
+            [clojure.string :as str]))
 
 ;; A detailed walk-through of this source code is provied in the docs:
 ;; https://github.com/Day8/re-frame/blob/master/docs/CodeWalkthrough.md
@@ -13,7 +14,7 @@
     (rf/dispatch [:timer now])))  ;; <-- dispatch used
 
 ;; Call the dispatching function every second.
-;; `defonce` is like `def` but it ensures only instance is ever
+;; `defonce` is like `def` but it ensures only one instance is ever
 ;; created in the face of figwheel hot-reloading of this file.
 (defonce do-timer (js/setInterval dispatch-timer-event 1000))
 
@@ -44,8 +45,7 @@
 (rf/reg-sub
   :time
   (fn [db _]     ;; db is current app state. 2nd unused param is query vector
-    (-> db
-        :time)))
+    (:time db))) ;; return a query computation over the application state
 
 (rf/reg-sub
   :time-color
@@ -61,7 +61,7 @@
    {:style {:color @(rf/subscribe [:time-color])}}
    (-> @(rf/subscribe [:time])
        .toTimeString
-       (clojure.string/split " ")
+       (str/split " ")
        first)])
 
 (defn color-input
@@ -86,4 +86,3 @@
   (rf/dispatch-sync [:initialize])     ;; puts a value into application state
   (reagent/render [ui]              ;; mount the application's ui into '<div id="app" />'
                   (js/document.getElementById "app")))
-
diff --git a/examples/todomvc/src/todomvc/views.cljs b/examples/todomvc/src/todomvc/views.cljs
index 5388041..7dad524 100644
--- a/examples/todomvc/src/todomvc/views.cljs
+++ b/examples/todomvc/src/todomvc/views.cljs
@@ -1,26 +1,27 @@
 (ns todomvc.views
   (:require [reagent.core  :as reagent]
-            [re-frame.core :refer [subscribe dispatch]]))
+            [re-frame.core :refer [subscribe dispatch]]
+            [clojure.string :as str]))
 
 
 (defn todo-input [{:keys [title on-save on-stop]}]
-  (let [val (reagent/atom title)
+  (let [val  (reagent/atom title)
         stop #(do (reset! val "")
                   (when on-stop (on-stop)))
-        save #(let [v (-> @val str clojure.string/trim)]
-               (when (seq v) (on-save v))
-               (stop))]
+        save #(let [v (-> @val str str/trim)]
+                (when (seq v) (on-save v))
+                (stop))]
     (fn [props]
       [:input (merge props
-                     {:type "text"
-                      :value @val
-                      :auto-focus true
-                      :on-blur save
-                      :on-change #(reset! val (-> % .-target .-value))
+                     {:type        "text"
+                      :value       @val
+                      :auto-focus  true
+                      :on-blur     save
+                      :on-change   #(reset! val (-> % .-target .-value))
                       :on-key-down #(case (.-which %)
-                                     13 (save)
-                                     27 (stop)
-                                     nil)})])))
+                                      13 (save)
+                                      27 (stop)
+                                      nil)})])))
 
 
 (defn todo-item
diff --git a/src/re_frame/interceptor.cljc b/src/re_frame/interceptor.cljc
index bc87bf0..3ba0a39 100644
--- a/src/re_frame/interceptor.cljc
+++ b/src/re_frame/interceptor.cljc
@@ -16,9 +16,9 @@
   "Create an interceptor from named arguments"
   [& {:as m :keys [id before after]}]
   (when debug-enabled?
-    (if-let [unknown-keys  (seq (clojure.set/difference
-                                  (-> m keys set)
-                                  mandatory-interceptor-keys))]
+    (if-let [unknown-keys (seq (set/difference
+                                (-> m keys set)
+                                mandatory-interceptor-keys))]
       (console :error "re-frame: ->interceptor " m " has unknown keys:" unknown-keys)))
   {:id     (or id :unnamed)
    :before before
@@ -195,4 +195,3 @@
       (invoke-interceptors :before)
       change-direction
       (invoke-interceptors :after)))
-