Displaying product results in react using hooks

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You cannot use this.setState in function component

         isLoading: false,
         searchTerm: searchTerm,
         searchedResults: results

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State Management with React Hooks,We now need to understand how to access state with useState, how to replace a lifecycle method with useEffect and how to consume a provider using a hook called useContext.,Making setInterval Declarative with React Hooks

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Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class.,Before we continue, note that Hooks are:,There are no plans to remove classes from React. You can read more about the gradual adoption strategy for Hooks in the bottom section of this page.

import React, { useState } from 'react';

function Example() {
  // Declare a new state variable, which we'll call "count"  const [count, setCount] = useState(0);
  return (
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me

After creating the project, at first, let's make a simple UI that has an input field and displays the list of search results.,In the component above, we create a simple input form(which currently doesn't do anything) and a mock list of the results that are going to be displayed.,After the filtered list is set on the searchResults state using the setSearchResult provided by React.useState hook.

import React from "react";
import ReactDOM from "react-dom";

function App() {
  return (
    <div className="App">
        <li>Item 1</li>
        <li>Item 2</li>

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Building React components is an art. There are many different ways to achieve similar results. You can use purely functional components or classes. You can build complex HOCs or keep everything flat. There are a lot of options when it comes to composition. With all these different choices, even implementing a simple data loading method might seem like a daunting task.,Get smarter at building your thing

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In this article, we will explore how to test React Hooks. We will pick a sufficiently complex hook and work on testing it.,My aim was to show you how to test React Hooks by taking an example of an async hook. I hope this helps you confidently tackle the testing of any kind of hook, as the same approach should apply to most of them.,In this section, we will see how to test hooks without using any libraries. This will provide us with an in-depth understanding of how to test React Hooks.

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The LogRocket Redux middleware package adds an extra layer of visibility into your user sessions. LogRocket logs all actions and state from your Redux stores. ,Depending on your use case, you may find useReducer quite testable.,Modernize how you debug your React apps — start monitoring for free.

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In this step, you’ll set the initial state on a component by assigning the initial state to a custom variable using the useState Hook. To explore Hooks, you’ll make a product page with a shopping cart, then display the initial values based on the state. By the end of the step, you’ll know the different ways to hold a state value using Hooks and when to use state rather than a prop or a static value.,For example, in this component, you have two pieces of data that will change based on user actions: the cart and the total cost. Each of these can be stored in state using the above Hook.,You now have some JSX that uses the .map method to iterate over the array and display the products.

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Adding State with React Hooks,In this section, I will show you how to use Hooks to create state and update the search results depending on that state. First, create a function that loads content from the Open Library web service. Open src/Search.js and paste the following code after the import statements.,Creating a React Application with Hooks

npx create - react - app react - books - with - hooks
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Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class…A hook is a special function that lets you “hook into” React features.,Hooks let us split the code based on what it is doing rather than a lifecycle method name.,As this article progresses, I will be discussing the three “basic” React.js hooks you will most likely come across as an engineer building out UI’s. They are:

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