Update snippet descriptions

snippets/isDateValid.md

@@ -3,13 +3,13 @@ title: isDateValid
 tags: date,intermediate
 ---
 
-Returns `true` if a valid date object can be created from the given values, `false` otherwise.
+Checks if a valid date object can be created from the given values.
 
 - Use the spread operator (`...`) to pass the array of arguments to the `Date` constructor.
 - Use `Date.prototype.valueOf()` and `Number.isNaN()` to check if a valid `Date` object can be created from the given values.
 
 ```js
-const isDateValid = (...val) => !isNaN(new Date(...val).valueOf());
+const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());
 ```
 
 ```js