The simplest React Hook

react-hook.js

import React, { useState } from 'react';

function ComponentExample() {
  const [ state, setState ] = useState({ counter:0 });
  const addToCounter = () => {
    const newCounterValue = state.counter + 1;

    setState({ counter: newCounterValue });
  }

  return (
    <div>
      <p>You clicked {state.counter} times</p>
      <button onClick={addToCounter}>
        Click me
      </button>
    </div>
  );
}

export default ComponentExample;