error The argument type 'List<String>' can't be assigned to the parameter type-CodePudding

I tried to do the sum by taking the model that I had made but the results were like. has anyone ever had a similar case and how to solve it.

this is the function that I made to do the addition with the type String parameter because in the API the data type is string.

  totalCalculate<NilaiMahasiswa>(nilaiAkhirUas, String nilaiIndeksAkhir) {
    int nilaiAkhirUas = int.parse(["nilay_akhir_uas"]!);
    double nilaiIndeksAkhir = double.parse(["nilay_akhir"]!);
    return nilaiAkhirUas   nilaiIndeksAkhir;
  }

and this is when I call the result of the sum above or in the function above but an error occurs

Flexible(
              child: FutureBuilder<NilaiMahasiswa>(
                future: Services().getNilaiMahasiswa(semester),
                builder: (context, snapshot) {
                  if (snapshot.hasData) {
                    return Text(
                      // 'IPK ${snapshot.data!.data?.first.updatedBy}',
                      'IPK $totalCalculate',
                      style: bold5,
                    );
                  } else if (snapshot.hasError) {
                    print(snapshot.data);
                    return Text('${snapshot.error}');
                  }
                  return const CircularProgressIndicator();
                },
              ),
            ),

and this is the error message that is displayed

CodePudding user response：

You are trying to parse int from List int.parse(["nilay_akhir_uas"]!) . Actually this will raise error. Maybe you just like to read the map, I guess the map is nilaiAkhirUas. So it is safe to .tryParse

  totalCalculate<NilaiMahasiswa>(nilaiAkhirUas, String nilaiIndeksAkhir) {
    int nilaiAkhirUas = int.tryParse(nilaiAkhirUas["nilay_akhir_uas"]??"")??0;
    double nilaiIndeksAkhir = double.tryParse(nilaiAkhirUas["nilay_akhir"]??"")??0;
    return nilaiAkhirUas   nilaiIndeksAkhir;
  }

Or if those parameters are string, you can do

  totalCalculate<NilaiMahasiswa>(nilaiAkhirUas, String nilaiIndeksAkhir) {
    int nilaiAkhirUas = int.tryParse(nilaiAkhirUas??"")??0;
    double nilaiIndeksAkhir = double.tryParse(nilaiIndeksAkhir)??0;
    return nilaiAkhirUas   nilaiIndeksAkhir;
  }

CodePudding user response：

int.parse expects String not List of String so,

  totalCalculate<NilaiMahasiswa>(nilaiAkhirUas, String nilaiIndeksAkhir) {
    int nilaiAkhirUas = int.parse(nilaiAkhirUas);
    double nilaiIndeksAkhir = double.parse(nilaiIndeksAkhir);
    return nilaiAkhirUas   nilaiIndeksAkhir;
  }

Should work

CodePudding user response：

maybe you wanted to do this:

 totalCalculate<NilaiMahasiswa>(nilaiAkhirUas, String nilaiIndeksAkhir) {
    int nilay_akhir_uas = int.parse(nilaiAkhirUas);
    double nilay_akhir = double.parse(nilaiIndeksAkhir);
    return nilay_akhir_uas   nilay_akhir;
  }