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How can I make components utilize the default values of the functions specified in the same file where the context was established through useContext?

asked 2022-04-26 11:00:00 +0000

devzero gravatar image

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answered 2022-10-18 09:00:00 +0000

woof gravatar image

To make components utilize the default values of the functions specified in the same file where the context was established through useContext, you can pass these default values as the initial value of the context provider.

For example, let's say you have a context file like this:

import { createContext, useState, useContext } from 'react';

export const MyContext = createContext();

export const MyContextProvider = ({ children }) => {
  const [value, setValue] = useState('default value');

  const myFunction = (newValue) => {
    setValue(newValue);
  };

  return (
    <MyContext.Provider value={{ value, myFunction }}>
      {children}
    </MyContext.Provider>
  );
};

export const useMyContext = () => useContext(MyContext);

In this example, the MyContextProvider component provides a default value of 'default value' for the value state and a default function myFunction that sets the state.

Now, in any other component that needs to utilize this context, you can use the useMyContext hook to retrieve the context value and use it as necessary. For example:

import React from 'react';
import { useMyContext } from './MyContext';

const MyComponent = () => {
  const { value, myFunction } = useMyContext();

  return (
    <>
      <p>{value}</p>
      <button onClick={() => myFunction('new value')}>Change Value</button>
    </>
  );
};

In this example, the MyComponent uses the useMyContext hook to retrieve the value and myFunction values from the context, and uses them to display the current value and provide a button to change it. When the button is clicked, the myFunction is called with the new value to update the state. If no new value is provided, the default value of 'default value' will be used.

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Asked: 2022-04-26 11:00:00 +0000

Seen: 1 times

Last updated: Oct 18 '22