use isArray instead of instanceof

snippets/last.md

@@ -8,7 +8,7 @@ Returns the last element in an array.
 Check if `arr` is an instance of an `Array`, use `arr.length - 1` to compute the index of the last element of the given array and return it, otherwise return `undefined`.
 
 ```js
-const last = arr => (arr instanceof Array ? arr[arr.length - 1] : undefined);
+const last = arr => (Array.isArray(arr) ? arr[arr.length - 1] : undefined);
 ```
 
 ```js