Merge pull request #1381 from webbiesdk/patch-1

Make async.transform actually support 2 arguments

3 files changed, 25 insertions, 1 deletions

diff --git a/lib/transform.js b/lib/transform.js
index 5d1342a..f001c51 100644
--- a/lib/transform.js
+++ b/lib/transform.js
@@ -50,7 +50,7 @@ import once from './internal/once';
  * })
  */
 export default function transform (coll, accumulator, iteratee, callback) {
-    if (arguments.length === 3) {
+    if (arguments.length <= 3) {
         callback = iteratee;
         iteratee = accumulator;
         accumulator = isArray(coll) ? [] : {};
diff --git a/mocha_test/filter.js b/mocha_test/filter.js
index 8f13620..a6cea2a 100644
--- a/mocha_test/filter.js
+++ b/mocha_test/filter.js
@@ -172,4 +172,17 @@ describe("reject", function () {
         });
     });
 
+    it('filter fails', function(done) {
+        async.filter({a: 1, b: 2, c: 3}, function (item, callback) {
+            if (item === 3) {
+                callback("error", false);
+            } else {
+                callback(null, true);
+            }
+        }, function (err, res) {
+            expect(err).to.equal("error");
+            expect(res).to.equal(undefined);
+            done();
+        })
+    });
 });
diff --git a/mocha_test/transform.js b/mocha_test/transform.js
index 5c04f56..a02b54b 100644
--- a/mocha_test/transform.js
+++ b/mocha_test/transform.js
@@ -51,4 +51,15 @@ describe('transform', function() {
             done();
         });
     });
+
+    it('transform with two arguments', function(done) {
+        try {
+            async.transform([1, 2, 3], function (a, v, k, callback) {
+                callback();
+            });
+            done();
+        } catch (e) {
+            expect.fail();
+        }
+    });
 });