Join egghead, unlock knowledge.

Want more egghead?

This lesson is for members. Join us? Get access to all 3,000+ tutorials + a community with expert developers around the world.

Unlock This Lesson
Become a member
to unlock all features

Level Up!

Access all courses & lessons on egghead today and lock-in your price for life.


    Use the map operator instead of firing events on a Subject


    In this lesson we will learn how to replace excessive subscribing and Subject emissions with simple uses of the map operator, simplifying our code and making it less bug-prone.