diff --git a/JavaScript/6-promise.js b/JavaScript/6-promise.js
index 07162c5..49b3a0a 100644
--- a/JavaScript/6-promise.js
+++ b/JavaScript/6-promise.js
@@ -42,8 +42,11 @@ class Queue {
finish(err, res) {
const { onFailure, onSuccess, onDone, onDrain } = this;
- if (err && onFailure) onFailure(err, res);
- else if (onSuccess) onSuccess(res);
+ if (err) {
+ if (onFailure) onFailure(err, res);
+ } else if (onSuccess) {
+ onSuccess(res);
+ }
if (onDone) onDone(err, res);
if (this.count === 0 && this.waiting.length === 0 && onDrain) onDrain();
}
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