Get immediate access to this and 4,000+ other videos and books.

Take your career further with a Pro subscription. With unlimited access to over 40+ books and 4,000+ professional videos in a single subscription, it’s simply the best investment you can make in your development career.

Learn About map Pro

This video was last updated on Aug 31 2021

Learn how map, one of the most useful higher-order functions, works behind the scenes, and try out some of its more custom cousins.