When calling setState, is the state updated immediately?

No, the state is not updated immediately when calling setState in React. Instead, React schedules the state update to occur asynchronously, typically in the next render cycle.

function Counter() {
  const [count, setCount] = useState(0);  
  const handleClick = () => {
    setCount(count + 1);
    console.log(count); // Logs the old value (0), not the updated value (1)
  };

  return (
    <button onClick={handleClick}>
      Count: {count}
    </button>
  );
}

Why is the State Update Not Immediate?

1. Asynchronous Nature:

• React batches multiple state updates for performance optimization.
• Instead of re-rendering the component immediately after each setState call, React groups them and applies the changes together to reduce the number of re-renders.

2. Rendering Cycle:

• When you call setState, React schedules the update and marks the component for re-rendering.
• The component re-renders in the next render cycle with the updated state.