Merge pull request #271 from WangYuLue/master

Update truthCheckCollection.md

snippets/truthCheckCollection.md

@@ -5,6 +5,6 @@ Checks if the predicate (second argument) is truthy on all elements of a collect
 Use `Array.every()` to check if each passed object has the specified property and if it returns a truthy value.
  
  ```js
-truthCheckCollection = (collection, pre) => (collection.every(obj => obj[pre]));
+const truthCheckCollection = (collection, pre) => (collection.every(obj => obj[pre]));
 // truthCheckCollection([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}], "sex") -> true
 ```