Update snippet descriptions

snippets/filterNonUniqueBy.md

@@ -3,9 +3,9 @@ title: filterNonUniqueBy
 tags: array,intermediate
 ---
 
-Filters out the non-unique values in an array, based on a provided comparator function.
+Returns an array with the non-unique values filtered out, based on a provided comparator function.
 
-- Use `Array.prototype.filter()` and `Array.prototype.every()` for an array containing only the unique values, based on the comparator function, `fn`.
+- Use `Array.prototype.filter()` and `Array.prototype.every()` to create an array containing only the unique values, based on the comparator function, `fn`.
 - The comparator function takes four arguments: the values of the two elements being compared and their indexes.
 
 ```js