Book Image

Designing React Hooks the Right Way

By : Fang Jin
Book Image

Designing React Hooks the Right Way

By: Fang Jin

Overview of this book

React hook creates a unique solution for using states in function components to orchestrate UI communication. They provide you with an easy interface to write custom data management solutions with low development and maintenance costs. Understanding how Hooks are designed enables you to use them more effectively, and this book helps you to do just that. This book starts with a custom-crafted solution to reveal why Hooks are needed in the first place. You will learn about the React engine and discover how each built-in Hook can manage a persistent value by hooking into it. You will walk through the design and implementation of each hook with code so that you gain a solid understanding. Finally, you'll get to grips with each Hook's pitfalls and find out how to effectively overcome them. By the end of this React book, you'll have gained the confidence to build and write Hooks for developing functional and efficient web applications at scale.
Table of Contents (12 chapters)


Appendix A – Not a Classical Memorization

It's very easy to confuse useMemo with a Memorization used in computer science, as the name indicates.

Memorization is an optimization technique in computer programs, primarily designed to speed up the process by storing the results of expensive operations and returning the cached result if it has been computed under the same condition before. The last part, "under the same condition before," is the part that makes it special.

The Fibonacci sequence is a classical memorization problem. If it's written using a recursive algorithm, it can be very costly; therefore, we tend to use cache storage to store all past calculated values:

const fibs = { 0: 1, 1: 1 }
function fib(n)  {
  if (!fibs[n]) {
    fibs[n] = fibs[n - 1] + fibs[n - 2]
  return fibs[n]

The preceding code gives a specialized fib function; if you call it sequentially...