react-native
  1. react-native-state
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React-Native State

Syntax

The state object is used to store component-level data within a React-Native component.

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

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

  const handlePress = () => {
    setCount(count + 1);
  };

  return (
    <>
      <Text>Count: {count}</Text>
      <Button onPress={handlePress} title="Increment Count" />
    </>
  );
};

export default MyComponent;

Example

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

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

  const handlePress = () => {
    setCount(count + 1);
  };

  return (
    <>
      <Text>Count: {count}</Text>
      <Button onPress={handlePress} title="Increment Count" />
    </>
  );
};

export default MyComponent;

Output

When the user clicks the Increment Count button, the count value will update on the screen.

Explanation

The state object is used to store component-level data within a React-Native component. The useState hook is used to declare and initialize the state variable, which can then be updated with the setCount function.

When the state value changes, React will automatically re-render the component and update the UI on the screen.

Use

The state object can be used to store component-level data and update the UI as needed.

Some common use cases for the state object include:

  • Storing user input values
  • Toggling component visibility
  • Counting the number of items in a list
  • Storing API data

Important Points

  • State updates are asynchronous, which means that updates may not happen immediately.
  • When updating state based on the previous state value, use a callback function to ensure that state updates are applied correctly.
  • Components should only use state to store data that affects the UI, not business logic.

Summary

The state object is an essential tool in React-Native development. By storing component-level data and updating the UI as needed, the state object enables developers to create dynamic and interactive mobile apps with React-Native.

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