How to sort List in dart based on value returned by a function - sorting

Question

I have to show a list of stores in a sorted order by nearest location
and I have a unsorted list of stores and a function to calculate
distance of each store from my current location but I don't know how
to sort List in dart based on value returned by a function.
I am getting the unsorted List of stores data from an api.
I need logic for this question for sorting the _kikkleStores List
class KikkleStoresBloc extends BlocBase {
List<KikkleStoreInfo> _kikkleStores = [];
//for distance sorting
List<KikkleStoreInfo> _kikkleStoresSorted = [];
List<double> distanceFromCurrentLocation;//already got
value in it
bool hasReachedEndOfList = false;
Coordinate _currentLocation;
KikkleStoresBloc();
final _kikkleStoreSubject =
BehaviorSubject<List<KikkleStoreInfo>>
();
// Getter Stream
Stream<List<KikkleStoreInfo>> get kikkleStores =>
_kikkleStoreSubject.stream;`enter code here`
// Getter Sink
Function(List<KikkleStoreInfo>) get _fetchedkikkleStores =>
_kikkleStoreSubject.sink.add;
getKikkleStores() async {
try {
if (_currentPage <= _totalPages) {
final response = await
ApiController.getKikkleStores(_currentPage);
_kikkleStores.addAll(response.item1);
//here how to sort _kikkleStores by using
getStoreDistance function
_totalPages = response.item3;
_fetchedkikkleStores(_kikkleStores);
if (_currentPage == _totalPages) {
hasReachedEndOfList = true;
} else if (_currentPage < _totalPages &&
_kikkleStores.length
< 10) {
}
}
}
}
// this function returns distance
getStoreDistance(Coordinate currentLocation, KikkleStoreInfo
store)
async {
if (currentLocation == null) return 0.0;
try {
double distanceInMeter = await
LocationUtils.getDistanceInMeters(
currentLocation, Coordinate(store.latitude,
store.longitude));
// final miles = (distanceInMeter / 1609.344).round();
return distanceInMeter;
} catch (e) {
return 0.0;
}
}
void getCurrentLocation() async {
try {
final isAllowed = await
PermissionsUtils.isLocationAccessAllowed();
if (isAllowed) {
final coordinates = await
LocationUtils.getCurrentLocation();
if (coordinates != null) {
_currentLocation = coordinates;
}
}
}
catch (e) {
print(e);
}
}
}

Answer 1

Take the reference of below code
void main(){
List<POJO> pojo = [POJO(5), POJO(3),POJO(7),POJO(1)];
// fill list
pojo..sort((a, b) => a.id.compareTo(b.id));
for(var i in pojo){
print(i.id); // prints list in sorted order i.e 1 3 5 7
}
}
class POJO {
int id;
POJO(this.id);
}

Answer 2

void sortfun() async {
for (int c = 0; c < (_kikkleStores.length - 1); c++) {
for (int d = 0; d < _kikkleStores.length - c - 1; d++) {
if (await getStoreDistance(_currentLocation, _kikkleStores[d]) >
await getStoreDistance(_currentLocation,
_kikkleStores[d + 1])) /* For descending order use < */
{
swap = _kikkleStores[d];
_kikkleStores[d] = _kikkleStores[d + 1];
_kikkleStores[d + 1] = swap;
}
}
}
}