Function componentDidUpdate

examples/async/src/containers/App.js:22–27

(prevProps)

  }

  componentDidUpdate(prevProps) {
    if (prevProps.selectedSubreddit !== this.props.selectedSubreddit) {
      const { dispatch, selectedSubreddit } = this.props
      dispatch(fetchPostsIfNeeded(selectedSubreddit))
    }
  }

  handleChange = nextSubreddit => {
    this.props.dispatch(selectSubreddit(nextSubreddit))