reactjs - React functional component using state

Question

I'm trying to implement a React smart component using functions as shown here https://hackernoon.com/react-stateless-functional-components-nine-wins-you-might-have-overlooked-997b0d933dbc

My problem is however that I need to maintain state, and how do I do it in this scenario, for example I need to access and set

this.state = {Title: 'Login'};

Answer 1

From React 16.8.0 You can use Hooks using useState to instantiate a State custom in your Functional Component. Like This...

import React, {useState} from 'react';

const AddButon = ({handleAddValue}) => {
  return <button onClick={handleAddValue}>Add</button>
}

const App = (props) =>{

  const [value, setValue] = useState(0);

  const handleAddValue = () => {
    const newValue = value+1;
    setValue(newValue);
  }

  return (
    <div>
      <div>The Value is: {value}</div>
      <AddButon handleAddValue={handleAddValue} />
    </div>);
}

If you want to read more about this new functionality, follow the following link.

https://reactjs.org/docs/hooks-intro.html