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What are the advantages of using React over plain JavaScript?

Q: What are the advantages of using React over plain JavaScript?

**Core concept (TL;DR).** With plain JS you **imperatively** find and mutate DOM nodes — verbose and error-prone as apps grow. React lets you write **declarative**, **component-based** UIs driven by state: you describe the result and React efficiently updates the DOM (via the virtual DOM). You gain reuse, maintainability, predictable state, and a vast ecosystem. Imperative DOM vs declarative, state-driven UI

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This question aims to understand why a candidate chooses React and recognizes its benefits.

benefitsdeclarativecomponentsvirtual dom

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State-driven vs manual DOM

import { useState } from "react";

// React: change state, UI follows. (No querySelector, no manual textContent.)
export default function App() {
  const [count, setCount] = useState(0);
  return (
    <div style={{ padding: 24, fontFamily: "system-ui" }}>
      <p>Count: {count}</p>
      <button onClick={() => setCount((c) => c + 1)}>+1</button>
      {/* Plain JS equivalent would be:
          document.querySelector("#count").textContent = ++count;  */}
    </div>
  );
}

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