Export Method/Function in React Native

How to create helper file full of functions in react native?

Quick note: You are importing a class, you can't call properties on a class unless they are static properties. Read more about classes here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes

There's an easy way to do this, though. If you are making helper functions, you should instead make a file that exports functions like this:

export function HelloChandu() {

}

export function HelloTester() {

}

Then import them like so:

import { HelloChandu } from './helpers'

or...

import functions from './helpers'
then
functions.HelloChandu

Export method/function in react native

Your syntax is opposite. You want to get responsiveHeight as width.

Try this

export { responsiveHeight as width } from "react-native-responsive-dimensions";

Use hook in export function - React Native

Hooks has some rules to follow - https://reactjs.org/docs/hooks-rules.html

Refactor code as below

import React from "react";
import { Text, TouchableOpacity } from "react-native";

function useChange() {
  const [state, setState] = React.useState(0);
  function change(value) {
    setState(value);
  }

  return { change, state };
}

export default function App() {
  const { change, state } = useChange();
  return (
    <TouchableOpacity
      onPress={() => {
        // Update state value on press
        change(state + 1);
      }}
    >
      <Text>Click Me!{state}</Text>
    </TouchableOpacity>
  );
}

How to export a function in react js?

addTask() is undefined because it's defined inside Form component, you can move it outside to change the scope:

function addTask (event) {
...
}
const Form = () => {

 const [task, setTask] = useState('');
.....
    
    return (
       ....
        )
    }
export { addTask };
export default Form;

ways of exporting the default function app with code inside in react native

You are defining different kind of components.

The first one is a functional component, defined with a function.

The second one is a class component, defined with a class.

For more information about the differences between them you can check https://www.geeksforgeeks.org/differences-between-functional-components-and-class-components-in-react/ or google it.

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