Coder wize: A Guide to Software Development Excellence

Exploring useRef Hook in React Native Applications React's useRef hook lets you make a reference to a specific DOM element or component instance. Several scenarios can benefit from this, such as: Using this hook, you can focus an input field or measure a component's size by accessing the underlying DOM element, storing a value, such as a timer ID or an instance of a third-party library, that keep to remain constant across multiple renders of a component. Use useRef to make a reference to a text input and use it to focus the input when a button is clicked, as shown in the following example: A ref object with only one property, current, is returned by useRef. The initial value passed as an argument, if any, will be used to initialize this property, and its value can be changed by using ref.current = newValue. It is essential to keep in mind that useRef is distinct from useState, where component re-rendering is triggered by state updates. useRef only alters the current property an...

Improve image performance in react native using react native fast image? Image Caching: What Is It? When it comes to issues like images loading and re-rendering from remote destination, caching is an excellent solution. What image caching is all about is downloading an image to the app's cache directory or any other directory the app has access to and then loading it from local storage the next time the image loads. Picture caching can be done in a number of different ways in React Native. There is a fantastic component known as React Native FastImage that takes care of all of your image caching without you having to write any additional code if you are developing a basic React Native application. If you're using Expo or working on a more complex project, you could even create your own image caching component from scratch. FastImage is a library for React Native that helps improve the performance of image loading by using native libraries to decode and display images. Some ben...

How to Use useCallback to Improve React Native Performance Memoizing a callback function is made possible by the useCallback hook in React. This indicates that the callback will only be recreated if one of the passed hook dependencies has changed. Performance optimization can benefit from this, particularly when passing callback props to child components. You must pass two arguments to the useCallback hook in order to use it: the callback function and a list of its dependencies. If any of the dependencies have changed, The hook will return a new callback function that will only be recreated if any of the dependencies have changed.. For example: const myCallback = useCallback(() => {   // Do something  }, [dependency1, dependency2]); After that, you can pass myCallback to a child component as a prop. Only if either dependency1 or dependency2 changes will the child component re-render. Keep in mind that the dependency array should not contain any props or state variables...

Tips for Optimizing React Native Flatlist Performance There are a few ways to  optimise  the performance of a FlatList in React Native: Utilize the prop initialNumToRender: You can set the number of items that should be displayed when the list loads for the first time with this prop. The list's initial load time can be speed up by setting this to a lower value. Make use of the prop onEndReachedThreshold: The distance at which the onEndReached callback will be triggered can be specified using this prop. You can improve performance and reduce the number of times the callback is called by setting this to a larger value. Utilize the prop keyExtractor: You can specify a unique keyExtractor for each item in the list with this prop. When items are added, removed, or rearranged, React can update the list more quickly by providing a keyExtractor. Make use of the prop removeClippedSubviews: If this prop is set to true, it will only render the items that are currently visi...

How to Quickly Fetch User Contacts in React Native Contacts play a crucial role in the digital world, whether it's making phone calls or finding friends on social media. On a smartphone, the bulky and cumbersome phone number book of yesteryear is now a compact list. Telephone numbers, email addresses, and other contact information are all unique to each individual. We'll look at React Native Contacts, a powerful contacts component that lets you use your React Native app to fetch, update, and add new contacts. We'll also go over a similar Expo module. You should be familiar with the fundamentals of React Native and Expo, including JSX, class and functional components, and styling, in order to follow along. This guide assumes that you have already completed the app's basic setup. In React Native, you can fetch the user’s contacts by using the react-native-contacts library. This library provides an easy-to-use API for accessing the device's contact list. To install the...

How to Optimize React Performance with useMemo Brief on how useMemo works A memoized value is returned by the useMemo Hook in React. Memoization is similar to saving a value from being recalculated by caching it. The only time the useMemo Hook runs is when one of its dependencies changes. This can help us to improve it's performance  Usememo syntax useMemo(calculateValue, dependencies) How to improve Performance by using  useMemo Using the useMemo Hook, you can stop expensive, resource-intensive functions from running all the time. We have an expensive function that runs on every render in this example. There will be a delay in execution when you change the count or add a to-do. A function that performs poorly. Every render calls the expensiveOperation function: import { useState } from "react"; import ReactDOM from "react-dom/client"; const App = () => {   const [count, setCount] = useState(0);   const [todos, setTodos] = useState([]);   const calculat...