initialize results in whilst [fixes #1626]whilst-first-it-fix

2 files changed, 19 insertions, 1 deletions

diff --git a/lib/whilst.js b/lib/whilst.js
index 1013d37..361b72d 100644
--- a/lib/whilst.js
+++ b/lib/whilst.js
@@ -40,7 +40,7 @@ function whilst(test, iteratee, callback) {
     callback = onlyOnce(callback);
     var _fn = wrapAsync(iteratee);
     var _test = wrapAsync(test);
-    var results
+    var results = [];
 
     function next(err, ...rest) {
         if (err) return callback(err);
diff --git a/test/whilst.js b/test/whilst.js
index 1c222c9..1ee6f11 100644
--- a/test/whilst.js
+++ b/test/whilst.js
@@ -64,6 +64,24 @@ describe('whilst', () => {
         }, 10)
     });
 
+    it('should not error when test is false on first iteration', (done) => {
+        var counter = 0;
+
+        async.whilst(
+            (cb) => cb(null, false),
+            (cb) => {
+                counter++;
+                cb(null);
+            },
+            (err, result) => {
+                expect(err).to.eql(null);
+                expect(result).to.be.undefined;
+                expect(counter).to.equal(0);
+                done();
+            }
+        );
+    });
+
     it('doWhilst', (done) => {
         var call_order = [];