diff --git a/src/clj/cljs/core.clj b/src/clj/cljs/core.clj
index c0d943814..61c0c530d 100644
--- a/src/clj/cljs/core.clj
+++ b/src/clj/cljs/core.clj
@@ -202,6 +202,9 @@
 (defmacro false? [x]
   (bool-expr (list 'js* "~{} === false" x)))
 
+(defmacro exists? [x]
+  (bool-expr (list 'js* "typeof ~{} !== 'undefined'" x)))
+
 (defmacro undefined? [x]
   (bool-expr (list 'js* "(void 0 === ~{})" x)))
 
diff --git a/src/cljs/cljs/core.cljs b/src/cljs/cljs/core.cljs
index 7e6ffd648..3a7fe099d 100644
--- a/src/cljs/cljs/core.cljs
+++ b/src/cljs/cljs/core.cljs
@@ -1004,6 +1004,10 @@ reduces them without incurring seq initialization"
   "Returns true if x is the value true, false otherwise."
   [x] (cljs.core/true? x))
 
+(defn ^boolean exists?
+  "Return true if object exists, false otherwise."
+  [x] (not= "undefined" (goog/typeOf x)))
+
 (defn ^boolean undefined? [x]
   (cljs.core/undefined? x))
 
diff --git a/web/vendor/jq-console b/web/vendor/jq-console
index 19e247d6f..309fa621f 160000
--- a/web/vendor/jq-console
+++ b/web/vendor/jq-console
@@ -1 +1 @@
-Subproject commit 19e247d6f546c64596073faed3ff7b0747f5d6b3
+Subproject commit 309fa621f107bccced6b461c0c703fbc64b24167