Convert string to double in csv loader (flutter) - flutter

Question

I have a csv dataset which contains numerical data.
eg:
76.21203492,30.86714946,0
76.23332579,30.86005251,1
76.14016701,30.85789648,2
I am reading this data using the following function:
loadAsset() async {
final myData = await rootBundle
.loadString("assets/data.csv");
List<List<dynamic>> csvTable = CsvToListConverter().convert(myData);
data = csvTable;
}
Now, I want to read the values.
Future<void> _onMapCreated(GoogleMapController controller) async {
await loadAsset();
setState(() {
_markers.clear();
int k = 0;
for (final loc in data) {
final marker = Marker(
markerId: MarkerId(loc[2]),
position: LatLng(double.parse(loc[0]), double.parse(loc[1])),
infoWindow: InfoWindow(
title: loc[2],
snippet: loc[2],
),
);
_markers[k.toString()] = marker;
k++;
}
});
But I am unable to do so.
It gives an error in line
LatLng(double.parse(loc[0]), double.parse(loc[1]))
quoting:
type 'double' is not a subtype of type 'String'
I also tried using the following function:
double convertion(String number) {
double value = 0;
int i = 0;
List<int> list = number.codeUnits.toList();
String zero = '0';
List<int> zeros = zero.codeUnits.toList();
while (number[i] != '.') {
value *= 10;
value += list[i].toDouble() - zeros[0].toDouble();
i++;
}
i++;
double decimal = 0;
int k = 0;
while (i < list.length) {
k++;
decimal *= 10;
decimal += list[i].toDouble() - zeros[0].toDouble();
i++;
}
decimal *= (pow(10, (k * (-1))));
value += decimal;
return value;
}
But I get the same error.

Answer 1

CsvToListConverter automatically parses all ints and doubles into the correct type, so double.parse(loc[0]) gives you an error because loc[0] is already a double, and you obviously can't parse a double from a double.
To fix this, change the line as follows:
From:
LatLng(double.parse(loc[0]), double.parse(loc[1]))
To:
LatLng(loc[0], loc[1])