Question:

What is React Native useState update

Solution

The useState hook in React Native and React for web applications is used to handle state in functional components. The function that lets you update the state value and the current state value are the two elements of the array that the useState hook returns.

Here's a basic illustration of a React Native functional component's use of state:

import React, { useState } from 'react';

import { View, Text, Button } from 'react-native';

const ExampleComponent = () => {

// Declare a state variable named "count" with an initial value of 0

const [count, setCount] = useState(0);

// Event handler function to update the state when the button is pressed

const handlePress = () => {

// Use the setCount function to update the "count" state

setCount(count + 1);

};

return (

<View>

<Text>Count: {count}</Text>

</View>

);

};

export default ExampleComponent;

The state variable in this example that contains the current value is called count.

To update the state, use the setCount function. It initiates a re-render with the updated state after receiving a new value as an argument.

The handlePress function is triggered when the button is pressed. It uses setCount(count + 1) to increase the count state.

Recall that the function that accepts the previous state as an argument may also be included in the argument passed to setCount. When the new state depends on the old state, this is helpful. As an illustration:

const handlePress = () => {

setCount(prevCount => prevCount + 1);

};

This guarantees that the state value you are using is the most recent one.

Credit:> StackOverflow

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