Implement *until via while

1 files changed, 6 insertions, 24 deletions

diff --git a/lib/async.js b/lib/async.js
index 5da3622..71f9a54 100644
--- a/lib/async.js
+++ b/lib/async.js
@@ -819,33 +819,15 @@
     };
 
     async.until = function (test, iterator, callback) {
-        callback = callback || noop;
-        if (!test()) {
-            iterator(function (err) {
-                if (err) {
-                    return callback(err);
-                }
-                async.until(test, iterator, callback);
-            });
-        }
-        else {
-            callback(null);
-        }
+        return async.whilst(function() {
+            return !test.apply(this, arguments);
+        }, iterator, callback);
     };
 
     async.doUntil = function (iterator, test, callback) {
-        callback = callback || noop;
-        iterator(_restParam(function (err, args) {
-            if (err) {
-                return callback(err);
-            }
-            if (!test.apply(null, args)) {
-                async.doUntil(iterator, test, callback);
-            }
-            else {
-                callback(null);
-            }
-        }));
+        return async.doWhilst(iterator, function() {
+            return !test.apply(this, arguments);
+        }, callback);
     };
 
     async.during = function (test, iterator, callback) {