How to remove an element from a http call? Flutter/Dart - flutter

Question

hello I am doing a http request and I want to remove the elements which have some specific value, for example if 'region' is 'USA' I don't want to receive it.
here is my call:
Future fetch() async {
if (isLoading) return;
isLoading = true;
const limit = 10;
final url = Uri.parse('https://everywhere-dev.iccs.gr:18083/evse/getEvsesPaged?page=$page&pageLimit=$limit&lat=' +
(this.widget.appController.currentLocation != null ? this.widget.appController.currentLocation!.latitude : this.widget.appController.originalMapPoint.latitude).toString() + '&lon=' +
(this.widget.appController.currentLocation != null ? this.widget.appController.currentLocation!.longitude : this.widget.appController.originalMapPoint.longitude).toString());
final response = await http.get(url);
if (response.statusCode == 200) {
final List newItems = json.decode(response.body)["results"];
setState(() {
page++;
isLoading = false;
if (newItems.length <limit) {
hasMore = false;
}
tempEvses.addAll(newItems.map<Evse>((items) {
final evseID = items['evseID'];
final friendlyName = items['friendlyName'];
final street = items['street'];
final streetNumber = items['streetNumber'];
final region = items['region'];
final lat = items['lat'] ?? 0.0;
final lng = items['lng'] ?? 0.0;
final connectorList = items['connectorList'];
final cpSerial = items['cpSerial'];
final img = items['img'];
return new Evse(evseID: evseID, friendlyName: friendlyName, street: street, streetNumber: streetNumber, region: region, lat: lat, lng: lng, connectorList: [connectorList], cpSerial: cpSerial, img: img);
}).toList());
for(int i=0 ; i<tempEvses.length; i++ ){
this.tempEvses[i].calculateDistance(widget.appController.currentLocation);
// this.tempEvses[i].calculateAvailability();
this.tempEvses[i].isEvseFavorite(widget.appController.favoritesList);
this.tempEvses[i].storePlugCounters();
}
showEvsePanels();
});
}
}

Answer 1

If you don't want to receive certain values you must work on the API and not on the app.
Maybe you couldn't work on the API so the only way is to work on the data that your app received.
You should try newItems.removeWhere((item) => item['region'] == 'USA')

Answer 2

Change you map to this:
tempEvses.addAll(
newItems.map<Evse>(
(items) {
final evseID = items['evseID'];
final friendlyName = items['friendlyName'];
final street = items['street'];
final streetNumber = items['streetNumber'];
final region = items['region'];
final lat = items['lat'] ?? 0.0;
final lng = items['lng'] ?? 0.0;
final connectorList = items['connectorList'];
final cpSerial = items['cpSerial'];
final img = items['img'];
if (region != 'USA') {
return new Evse(
evseID: evseID,
friendlyName: friendlyName,
street: street,
streetNumber: streetNumber,
region: region,
lat: lat,
lng: lng,
connectorList: [connectorList],
cpSerial: cpSerial,
img: img);
}
},
).toList(),
);