Notifying parent components about state changes

notify-parent-components-about-state-change.ts

function Toggle({ onChange }) {
  const [isOn, setIsOn] = useState(false);

  function updateToggle(nextIsOn) {
    // ✅ Good: Perform all updates during the event that caused them
    setIsOn(nextIsOn);
    onChange(nextIsOn);
  }

  function handleClick() {
    updateToggle(!isOn);
  }

  function handleDragEnd(e) {
    if (isCloserToRightEdge(e)) {
      updateToggle(true);
    } else {
      updateToggle(false);
    }
  }

  // ...
}