Did you write on JavaScript — pure JS or some framework, like React?

Depending on the task and project requirements, you can use either pure JavaScript or frameworks. For example, for small scripts or simple interactive elements, pure JS is sufficient.

If we are talking about complex interfaces with dynamic data updates and component architecture, React or other popular frameworks (Vue, Angular) are often chosen. React allows creating reusable components, managing state, and efficiently updating the DOM.

Example of a simple React component:

import React, { useState } from 'react';

function Counter() {
  const [count, setCount] = useState(0);
  return (
    <div>
      <p>Counter: {count}</p>
      <button onClick={() => setCount(count + 1)}>Increase</button>
    </div>
  );
}

export default Counter;

Thus, the choice depends on the complexity of the task and team preferences.