Fix reject snippet's description

snippets/reject.md

@@ -3,7 +3,9 @@ title: reject
 tags: array,beginner
 ---
 
-Takes a predicate and array, like `Array.prototype.filter()`, but only keeps `x` if `pred(x) === false`.
+Filters an array's values based on a predicate function, returning only values for which the predicate function returns `true`.
+
+Use `Array.prototype.filter()` in combination with the predicate function, `pred`, to return only the values for which `pred()` returns `true`.
 
 ```js
 const reject = (pred, array) => array.filter((...args) => !pred(...args));
@@ -12,4 +14,4 @@ const reject = (pred, array) => array.filter((...args) => !pred(...args));
 ```js
 reject(x => x % 2 === 0, [1, 2, 3, 4, 5]); // [1, 3, 5]
 reject(word => word.length > 4, ['Apple', 'Pear', 'Kiwi', 'Banana']); // ['Pear', 'Kiwi']
-```
+```