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.


    Create Map and Filter Transducers


    In our previous lesson, we created map() and filter() functions based on reduce, but we still couldn’t compose them together.

    In this lesson, we’ll solve this by making these functions into transducers. This will let us compose the reducing behavior of map() and filter(), without coupling this composed transform to a data type.