Null Safety Switch Dartpad

[Sicario]

Mohon info cara memunculkan switch null safety di dartpad.
Sudah dicoba menggunakan beberapa browser berbeda, tetap sama. Terima kasih

[Anonymous]

Bisa dilihat disini ya
https://medium.com/nerd-for-tech/flutter-2-null-safety-in-a-nutshell-f20aeb74772#:~:text=You%20can%20enable%20or%20disable,the%20URL%20null_safety%20to%20false.&text=To%20disable%20null%20safety%20in,.dev%2F%3Fnull_safety%3Dfalse.

Atau boleh tekan langsung di
https://dartpad.dev/?null_safety=false

[Sicario]

Coach, pakai https://dartpad.dev/?null_safety=false masih belum berhasil.

Syntax:
class Manusia{
String nama;
int umur;
Manusia({this.nama, this.umur});
}

void main(){
var m1 = Manusia(nama: ‘Andi’,umur: 17);
print(m1.nama);
print(m1.umur);
}

Pesan Error:
Error compiling to JavaScript:
Info: Compiling with sound null safety
Warning: Interpreting this as package URI, ‘package:dartpad_sample/main.dart’.
lib/main.dart:4:17:
Error: The parameter ‘nama’ can’t have a value of ‘null’ because of its type ‘String’, but the implicit default value is ‘null’.
Manusia({this.nama, this.umur});
^^^^
lib/main.dart:4:28:
Error: The parameter ‘umur’ can’t have a value of ‘null’ because of its type ‘int’, but the implicit default value is ‘null’.
Manusia({this.nama, this.umur});
^^^^
Error: Compilation failed.

[Anonymous]

Bisa dicoba menggunakan ini
class Manusia{
String? nama;
int? umur;
Manusia({this.nama, this.umur});
}

void main(){
var m1 = Manusia(nama: ‘Andi’,umur: 17);
print(m1.nama);
print(m1.umur);
}

Diberikan tanda tanya, yang artinya, kemungkinan isi dari nama/umur bisa null

[Author]

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