useState in React Hooks

useState.js

import React, { useState } from "react";
import ReactDOM from "react-dom";

function App() {
  const [count, setCount] = useState(0);
  const increaseCount = () => {
    setCount(count + 1)
  }

  const decreaseCount = () => {
    setCount(count - 1)
  }

  return (
    <div className="App">
      <button onClick={() => increaseCount()}>Increase Count</button>
      <button onClick={() => decreaseCount()}>Decrease Count</button>
      <h1>{`COUNT IS ${count}`}</h1>
    </div>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);