1 files changed, 5 insertions, 8 deletions
diff --git a/lib/internal/parallel.js b/lib/internal/parallel.js
index bbfdb42..89e181e 100644
--- a/lib/internal/parallel.js
+++ b/lib/internal/parallel.js
@@ -1,21 +1,18 @@
 import isArrayLike from './isArrayLike';
 import noop from './noop';
-import slice from './slice';
 import wrapAsync from './wrapAsync';
 
 export default function _parallel(eachfn, tasks, callback) {
     callback = callback || noop;
     var results = isArrayLike(tasks) ? [] : {};
 
-    eachfn(tasks, function (task, key, callback) {
-        wrapAsync(task)(function (err, result) {
-            if (arguments.length > 2) {
-                result = slice(arguments, 1);
+    eachfn(tasks, (task, key, callback) => {
+        wrapAsync(task)((err, ...result) => {
+            if (result.length < 2) {
+                result = result[0];
             }
             results[key] = result;
             callback(err);
         });
-    }, function (err) {
-        callback(err, results);
-    });
+    }, err => callback(err, results));
 }