prevPage method
Implementation
Future<List<ApiResult>?> prevPage({bool isTrendingVideos = false}) async {
if (prevPageToken == null) return null;
final url = _getPrevPageUri(onlyVideos: isTrendingVideos);
var res = await http.get(url, headers: headers);
var jsonData = json.decode(res.body);
return _getResultsFromJson(jsonData,
isSpecificKind: isTrendingVideos, newPage: page - 1);
}