usestate access previous state

1import React, { useState } from "react";
2import ReactDOM from "react-dom";
3
4function Counter() {
5  const [count, setCount] = useState(0);
6
7  return (
8    <div>
9      <h1>{count}</h1>
10      <button onClick={() => setTimeout(() => setCount(count + 1), 2000)}>
11        Delayed Counter (basic)
12      </button>
13      <button onClick={() => setTimeout(() => setCount(x => x + 1), 2000)}>
14        Delayed Counter (functional)
15      </button>
16      <button onClick={() => setCount(count + 1)}>Immediate Counter</button>
17    </div>
18  );
19}
20
21const rootElement = document.getElementById("root");
22ReactDOM.render(<Counter />, rootElement);
23

1const [arrayOfObjs, handleObjSelection] = useState([]);
2
3// on a buttton for example
4<button
5  onClick={selectedObj => handleObjSelection(
6              prevSelected => [...prevSelected, selectedObj],
7  		  ))}
8>
9