We have built a spreadsheet application with functional programming, React, and Flux in this chapter. We have discovered the limitations of functional programming and learned how we can take advantage of it. We have written automated unit tests for parts of the code that we have written. We also saw how we can traverse data structures and write a parser with functional programming. With the Flux architecture, we learnt how we can write the biggest part of the application with pure functions.
In the next chapter, we will see more of functional programming. We will rebuild Pac-Man with the HTML5 canvas.