IFFISwitch.jsx

import React from "react";

export default function IFFISwitch() {
  const [key, setKey] = React.useState("first");
  return (
    <div>
      <div>
        {(() => {
          switch (key) {
            case "first":
              return "This is First Case";
            case "second":
              return "This is Second Case";
            default:
              return "This is default value";
          }
        })()}
      </div>
      <br />
      <div>
        <button onClick={() => setKey("first")}>First</button>
        <button onClick={() => setKey("second")}>second</button>
      </div>
    </div>
  );
}