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.


    Avoid Common Mistakes when Working with Reduce


    In this lesson, we will be looking at two common mistakes programmers make when working with reduce. We will see why we always need to pass in an initial value for our accumulator as well as return the accumulator.