Merge pull request #823 from megawac/do-via-whilst

Implement doWhilst via whilst

1 files changed, 12 insertions, 17 deletions

diff --git a/lib/async.js b/lib/async.js
index 67eb379..0cde368 100644
--- a/lib/async.js
+++ b/lib/async.js
@@ -778,31 +778,26 @@
     async.whilst = function (test, iterator, callback) {
         callback = callback || noop;
         if (test()) {
-            iterator(function (err) {
+            var next = _restParam(function(err, args) {
                 if (err) {
-                    return callback(err);
+                    callback(err);
+                } else if (test.apply(this, args)) {
+                    iterator(next);
+                } else {
+                    callback(null);
                 }
-                async.whilst(test, iterator, callback);
             });
-        }
-        else {
+            iterator(next);
+        } else {
             callback(null);
         }
     };
 
     async.doWhilst = function (iterator, test, callback) {
-        callback = callback || noop;
-        iterator(_restParam(function (err, args) {
-            if (err) {
-                return callback(err);
-            }
-            if (test.apply(null, args)) {
-                async.doWhilst(iterator, test, callback);
-            }
-            else {
-                callback(null);
-            }
-        }));
+        var calls = 0;
+        return async.whilst(function() {
+            return ++calls <= 1 || test.apply(this, arguments);
+        }, iterator, callback);
     };
 
     async.until = function (test, iterator, callback) {