conditional rendering in react js stackoverflow

//conditional rendering in react JS  
<Container>
    {this.state.watchlist.length === 0 && <h1>no movies</h1>}

    {this.state.watchlist.map(item => (<WatchlistMovie
      className="watchlist-movie"
      key={item.id}
      id={item.id}
      title={item.title}
      poster={item.poster}
      overview={item.overview}
      rating={item.rating}
      user={this.props.user}
    />))}

  </Container>