jquery/learn.jquery.com — pull request #597 by arthurvr (2014-12-29 13:13:44+00:00)
Title: using-jquery-core/utility-methods: add type checking section

This PR adds info about type checking utility methods to `using-jquery-core/utility-methods`. Would fix https://github.com/jquery/learn.jquery.com/issues/404 on the while.