To pass a state variable to another component that is not related, you will need to lift the state up to a common ancestor component and then pass it down as a prop to the desired component.

Here is an example in JavaScript:

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// ParentComponent.js
import React, { useState } from 'react';
import ChildComponent from './ChildComponent';

const ParentComponent = () => {
  const [stateVariable, setStateVariable] = useState('');

  return (
    <div>
      <ChildComponent stateVariable={stateVariable} />
    </div>
  );
};

export default ParentComponent;

// ChildComponent.js
import React from 'react';

const ChildComponent = ({ stateVariable }) => {
  // Use the stateVariable in this component

  return (
    <div>
      <p>{stateVariable}</p>
    </div>
  );
};

export default ChildComponent;

In this example, the stateVariable is initially empty in the ParentComponent, and it is passed down to the ChildComponent as a prop. The ChildComponent can then use the stateVariable prop to display its value.

By lifting the state up to a common ancestor component, you can share state between multiple components, even if they are not directly related.

In React, a prop (short for "property") is a way to pass data from a parent component to its child component. It allows the parent component to share information with its child component, which can then use that data to render UI or perform other operations.

Here's a simple example to illustrate how props work in React:

Parent component (App.js):

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import React from 'react';
import ChildComponent from './ChildComponent';

const App = () => {
  const message = "Hello from parent component";

  return (
    <div>
      <ChildComponent text={message} />
    </div>
  );
}

export default App;

Child component (ChildComponent.js):

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import React from 'react';

const ChildComponent = (props) => {
  return (
    <div>
      <p>{props.text}</p>
    </div>
  );
}

export default ChildComponent;

In this example, the parent component (App.js) passes a prop called text to the child component (ChildComponent.js) with the value of "Hello from parent component". The child component then receives this prop as props.text and renders it inside a paragraph element.

Props are a fundamental concept in React and are commonly used to customize and configure components based on varying data.

The createContext React hook is used to create a Context object that can then be used to pass data through the Component tree. The provider prop is used to provide the context data which should be available to any components below it in the tree.

For example, using the following code we can create a context and provide an initial value for it:

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const { Provider, Consumer } = React.createContext(initialValue);

The Provider is an object that can be used to wrap child components, providing the initial value to be passed through the Context object. The Consumer object will be used by the child components to access the values provided by the Provider.

For example, using the following code, we can wrap a child component with the Provider and access the values provided in it:

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const App = () => (
  <Provider value={myValue}>
    <MyChildComponent />
  </Provider>
);

const MyChildComponent = () => (
  <Consumer>
    {value => {
      // Do something with the value
    }}
  </Consumer>
);