Code review of React components Comments and CommentsEditor: identify logical and UX issues in the code (e.g., incorrect index saving when closing the curtain, problems with updating value when props change).

In the code of React components Comments and CommentsEditor, the following logical and UX issues are often encountered:

1. Incorrect saving of the index when closing the curtain — if the index of the selected comment is stored in local state and not synchronized with the parent component or URL, closing and reopening the curtain may reset the index or it may not match the expected value. The solution is to store the index in a state that does not reset on close, for example, in the parent component or in global state.

2. Issues with updating value when props change — if the CommentsEditor component uses local state for value, and the value prop does not update when props change, the input field may display outdated data. This happens when value and local state are not synchronized. To fix this, use useEffect to update local state when the prop changes, or make the component controlled, fully dependent on the value prop.

Example of fixing the value issue:

function CommentsEditor({ value, onChange }) {
  const [localValue, setLocalValue] = React.useState(value);

  React.useEffect(() => {
    setLocalValue(value);
  }, [value]);

  return (
    <textarea
      value={localValue}
      onChange={e => {
        setLocalValue(e.target.value);
        onChange(e.target.value);
      }}
    />
  );
}

3. UX issues:

• Lack of state preservation during navigation or page refresh.
• Non-obvious behavior of the curtain (e.g., closing on outside click, but without warning about unsaved changes).
• Absence of a loading indicator when saving comments.

It is recommended to carefully think through state management and synchronization of props and local state, as well as improve UX through user notifications and data saving.