React Hooks in Action: With Suspense and Concurrent Mode

React Hooks in Action
contents
preface
acknowledgments
about this book
Who should read this book
How this book is organized: A roadmap
About the code
liveBook discussion forum
Other online resources
about the author
about the cover illustration
Part 1
1 React is evolving
1.1 What is React?
1.1.1 Building a UI from components
1.1.2 Synchronizing state and UI
1.1.3 Understanding component types
1.2 What’s new in React?
1.3 React Hooks can add state to function components
1.3.1 Stateful function components: Less code, better organization
1.3.2 Custom hooks: Easier code reuse
1.3.3 Third-party hooks provide ready-made, well-tested functionality
1.4 Better UX with Concurrent Mode and Suspense
1.4.1 Concurrent Mode
1.4.2 Suspense
1.5 React’s new publication channels
1.6 Whom is this book for?
1.7 Getting started
Summary
2 Managing component state with the useState hook
2.1 Setting up the bookings manager app
2.1.1 Generating the app skeleton with create-react-app
2.1.2 Editing the four key files
2.1.3 Adding a database file for the application
2.1.4 Creating page components and a UserPicker.js file
2.2 Storing, using, and setting values with useState
2.2.1 Assigning new values to variables doesn’t update the UI
2.2.2 Calling useState returns a value and an updater function
2.2.3 Calling the updater function replaces the previous state value
2.2.4 Passing a function to useState as the initial value
2.2.5 Using the previous state when setting the new state
2.3 Calling useState multiple times to work with multiple values
2.3.1 Using a drop-down list to set state
2.3.2 Using a check box to set state
2.4 Reviewing some function component concepts
Summary
3 Managing component state with the useReducer hook
3.1 Updating multiple state values in response to a single event
3.1.1 Taking users out of the movie with unpredictable state changes
3.1.2 Keeping users in the movie with predictable state changes
3.2 Managing more complicated state with useReducer
3.2.1 Updating state using a reducer with a predefined set of actions
3.2.2 Building a reducer for the BookablesList component
3.2.3 Accessing component state and dispatching actions with useReducer
3.3 Generating the initial state with a function
3.3.1 Introducing the WeekPicker component
3.3.2 Creating utility functions to work with dates and weeks
3.3.3 Building the reducer to manage dates for the component
3.3.4 Passing an initialization function to the useReducer hook
3.3.5 Updating BookingsPage to use WeekPicker
3.4 Reviewing some useReducer concepts
Summary
4 Working with side effects
4.1 Exploring the useEffect API with simple examples
4.1.1 Running side effects after every render
4.1.2 Running an effect only when a component mounts
4.1.3 Cleaning up side effects by returning a function
4.1.4 Controlling when an effect runs by specifying dependencies
4.1.5 Summarizing the ways to call the useEffect hook
4.1.6 Calling useLayoutEffect to run an effect before the browser repaints
4.2 Fetching data
4.2.1 Creating the new db.json file
4.2.2 Setting up a JSON server
4.2.3 Fetching data within a useEffect hook
4.2.4 Working with async and await
4.3 Fetching data for the BookablesList component
4.3.1 Examining the data-loading process
4.3.2 Updating the reducer to manage loading and error states
4.3.3 Creating a helper function to load data
4.3.4 Loading the bookables
Summary
5 Managing component state with the useRef hook
5.1 Updating state without causing a re-render
5.1.1 Comparing useState and useRef when updating state values
5.1.2 Calling useRef
5.2 Storing timer IDs with a ref
5.3 Keeping references to DOM elements
5.3.1 Setting focus on an element in response to an event
5.3.2 Managing a text box via a ref
Summary
6 Managing application state
6.1 Passing shared state to child components
6.1.1 Passing state from a parent by setting props on the children
6.1.2 Receiving state from a parent as a prop
6.1.3 Receiving an updater function from a parent as a prop
6.2 Breaking components into smaller pieces
6.2.1 Seeing components as part of a bigger app
6.2.2 Organizing multiple components within a page’s UI
6.2.3 Creating a BookableDetails component
6.3 Sharing the state and dispatch function from useReducer
6.3.1 Managing state in the BookablesView component
6.3.2 Removing an action from the reducer
6.3.3 Receiving state and dispatch in the BookablesList component
6.4 Sharing the state value and updater function from useState
6.4.1 Managing the selected bookable in the BookablesView component
6.4.2 Receiving the bookable and updater function in BookablesList
6.5 Passing functions to useCallback to avoid redefining them
6.5.1 Depending on functions we pass in as props
6.5.2 Maintaining function identity with the useCallback hook
Summary
7 Managing performance with useMemo
7.1 Breaking the cook’s heart by calling, “O, shortcake!”
7.1.1 Generating anagrams with an expensive algorithm
7.1.2 Avoiding redundant function calls
7.2 Memoizing expensive function calls with useMemo
7.3 Organizing the components on the Bookings page
7.3.1 Managing the selected bookable with useState
7.3.2 Managing the selected week and booking with useReducer and useState
7.4 Efficiently building the bookings grid with useMemo
7.4.1 Generating a grid of sessions and dates
7.4.2 Generating a lookup for bookings
7.4.3 Providing a getBookings data-loading function
7.4.4 Creating the BookingsGrid component and calling useMemo
7.4.5 Coping with racing responses when fetching data in useEffect
Summary
8 Managing state with the Context API
8.1 Needing state from higher up the component tree
8.1.1 Displaying a call-to-action message when the page first loads
8.1.2 Displaying booking information when a visitor selects a booking
8.1.3 Displaying an edit button for a user’s bookings: The problem
8.1.4 Displaying an edit button for a user’s bookings: The solution
8.2 Working with custom providers and multiple contexts
8.2.1 Setting an object as the context provider’s value
8.2.2 Moving the state to a custom provider
8.2.3 Working with multiple contexts
8.2.4 Specifying a default value for a context
Summary
9 Creating your own hooks
9.1 Extracting functionality into custom hooks
9.1.1 Recognizing functionality that could be shared
9.1.2 Defining custom hooks outside your components
9.1.3 Calling custom hooks from custom hooks
9.2 Following the Rules of Hooks
9.2.1 Call hooks only at the top level
9.2.2 Call hooks only from React functions
9.2.3 Using an ESLint plugin for the rules of hooks
9.3 Extracting further examples of custom hooks
9.3.1 Accessing window dimensions with a useWindowSize hook
9.3.2 Getting and setting values with a useLocalStorage hook
9.4 Consuming a context value with a custom hook
9.5 Encapsulating data fetching with a custom hook
9.5.1 Creating the useFetch hook
9.5.2 Using the data, status, and error values the useFetch hook returns
9.5.3 Creating a more specialized data-fetching hook: useBookings
Summary
10 Using third-party hooks
10.1 Accessing state in the URL with React Router
10.1.1 Setting up routes to enable nesting
10.1.2 Adding nested routes to the Bookables page
10.1.3 Accessing URL parameters with the useParams hook
10.1.4 Navigating with the useNavigate hook
10.2 Getting and setting query string search parameters
10.2.1 Getting search parameters from the query string
10.2.2 Setting the query string
10.3 Streamlining data-fetching with React Query
10.3.1 Introducing React Query
10.3.2 Giving components access to a React Query client
10.3.3 Fetching data with useQuery
10.3.4 Accessing data in the query cache
10.3.5 Updating server state with useMutation
Summary
Part 2
11 Code splitting with Suspense
11.1 Importing code dynamically with the import function
11.1.1 Setting up a web page to load JavaScript when a button is clicked
11.1.2 Using default and named exports
11.1.3 Using static imports to load JavaScript
11.1.4 Calling the import function to dynamically load JavaScript
11.2 Importing components dynamically with lazy and Suspense
11.2.1 Converting a component to a lazy component with the lazy function
11.2.2 Specifying fallback content with the Suspense component
11.2.3 Understanding how lazy and Suspense work together
11.2.4 Code splitting an app on its routes
11.3 Catching errors with error boundaries
11.3.1 Checking out the error boundary example in the React docs
11.3.2 Creating our own error boundary
11.3.3 Recovering from errors
Summary
12 Integrating data fetching with Suspense
12.1 Data fetching with Suspense
12.1.1 Upgrading promises to include their status
12.1.2 Using the promise status to integrate with Suspense
12.1.3 Fetching data as early as possible
12.1.4 Fetching new data
12.1.5 Recovering from errors
12.1.6 Checking the React docs
12.2 Using Suspense and error boundaries with React Query
12.3 Loading images with Suspense
12.3.1 Using React Query and Suspense to provide an image-loading fallback
12.3.2 Prefetching images and data with React Query
Summary
13 Experimenting with useTransition, useDeferredValue, and SuspenseList
13.1 Making smoother transitions between states
13.1.1 Avoiding receded states with useTransition
13.1.2 Giving users feedback with isPending
13.1.3 Integrating transitions with common components
13.1.4 Holding on to old values with useDeferredValue
13.2 Using SuspenseList to manage multiple fallbacks
13.2.1 Showing data from multiple sources
13.2.2 Controlling multiple fallbacks with SuspenseList
13.3 Concurrent Mode and the future
Summary
index
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