This Lesson is for PRO Members

Subscribe today and get access to all lessons! Plus direct HD download for offline use, enhances transcripts, member comment forums, and iTunes "podcast" RSS feed. Level up your skills now!

Unlock This Lesson

Already subscribed? Sign In

Autoplay
Hide playlist

    Check if a Value is in an Array with indexOf

    indexOf is used to search for a value or reference inside of an array. In this lesson we first look at what values are returned when a search is successful vs when it's unsuccessful. Then we move onto a technique that shows how to use the return value to create a boolean flag that can be checked easily. We end by filtering 1 array based on the existence of a value in a whitelist array.

    You must be a Member to view code