gistfile1.txt

class App extends Component {
  _isMounted = false;
  constructor(props) {
    ...
}
...
  componentDidMount() {
    this._isMounted = true;
    const { searchTerm } = this.state;
    this.setState({ searchKey: searchTerm });
    this.fetchSearchTopStories(searchTerm);
}
  componentWillUnmount() {
    this._isMounted = false;
}
... }


fetchSearchTopStories(searchTerm, page = 0) {
    axios(`${PATH_BASE}${PATH_SEARCH}?${PARAM_SEARCH}${searchTerm}&${PARAM_PAGE}${pa\
ge}&${PARAM_HPP}${DEFAULT_HPP}`)
      .then(result => this._isMounted && this.setSearchTopStories(result.data))
      .catch(error => this._isMounted && this.setState({ error }));
}