diff --git a/snippets/group-by.md b/snippets/group-by.md
index 44505eb2f..ec8074ea2 100644
--- a/snippets/group-by.md
+++ b/snippets/group-by.md
@@ -5,9 +5,8 @@ Use `Array.reduce()` to create an object, where the keys are produced from the m
 
 ```js
 const groupBy = (arr, func) =>
-  arr
-    .map(typeof func === 'function' ? func : val => val[func])
-    .reduce((acc, val, i) => { acc[val] = (acc[val] || []).concat(arr[i]); return acc; }, {})
+  arr.map(typeof func === 'function' ? func : val => val[func])
+    .reduce((acc, val, i) => { acc[val] = (acc[val] || []).concat(arr[i]); return acc; }, {});
 // groupBy([6.1, 4.2, 6.3], Math.floor) -> {4: [4.2], 6: [6.1, 6.3]}
 // groupBy(['one', 'two', 'three'], 'length') -> {3: ['one', 'two'], 5: ['three']}
 ```