also update inner array init

snippets/initialize2DArray.md

@@ -6,7 +6,7 @@ Use `Array.map()` to generate h rows where each is a new array of size w initial
 
 ```js
 const initialize2DArray = (w, h, val = null) =>
-  Array.from({ length: h }).map(() => Array(w).fill(val));
+  Array.from({ length: h }).map(() => Array.from({ length: w}).fill(val));
 ```
 
 ```js