diff --git a/desktop/sources/scripts/library.js b/desktop/sources/scripts/library.js
index eefe105..d973a5a 100644
--- a/desktop/sources/scripts/library.js
+++ b/desktop/sources/scripts/library.js
@@ -377,11 +377,8 @@ function Library (ronin) {
     }
   }
 
-  this.map = async (arr, fn) => { // Run a function on each element in a list.
-    for (let i = 0; i < arr.length; i++) {
-      const arg = arr[i]
-      arr[i] = await fn(arg)
-    }
+  this.map = (arr, fn) => { // Run a function on each element in a list.
+    return Promise.all(arr.map(fn)).then( result => { return result } )
   }
 
   this.filter = (arr, fn) => { // Remove from list, when function returns false.
diff --git a/examples/benchmark/general.lisp b/examples/benchmark/general.lisp
index e240340..93e7faf 100644
--- a/examples/benchmark/general.lisp
+++ b/examples/benchmark/general.lisp
@@ -36,7 +36,7 @@
   (test "range with step" (range 0 4 2) (0 2 4))
   (test "range with negative step" (range 0 -4 -1) (0 -1 -2 -3 -4))
   (test "map" (map (1 2 3) (λ (a) (add 1 a))) (2 3 4))
-  (test "filter" (filter (2 3 4 5 6)) (λ (a) (eq 0 (mod a 2))) (2 4 6))
+  (test "filter" (filter (2 3 4 5 6) (λ (a) (eq 0 (mod a 2)))) (2 4 6))
   (test "reduce" (reduce (1 2 3) (λ (acc val) (add acc val)) 4) 10)
 
 ; Scope
@@ -65,4 +65,4 @@
 (echo (filepath))
 (echo (dirpath))
 (echo (file))
-(echo (dir))
\ No newline at end of file
+(echo (dir))