smartherd / darttutorial Goto Github PK

I found my interest in this repo so I just download it and open it into VSCode and found some error like
e.i. in 17_default_parameters has a function
int findVolume(int length, {int breadth = 2, int height = 20}) {
print("Lenght is $length");
print("Breadth is $breadth");
print("Height is $height");

print("Volume is ${length * breadth * height}");
}
this function doesn't return an integer value although the type is int.
Correct me If I did any mistake from my side.

Thank You

I just started with dart but it seems that this tutorial is outdated and the most recent dart version has
groundbreaking changes that break backwards compatibility.

this is from 21_getters_setters for example:

class Student {

  String name; // Non-nullable instance field 'name' must be initialized.

  double _percent; // Non-nullable instance field '_percent' must be initialized.

  void set percentage(double marksSecured) => _percent = (marksSecured / 500) * 100;

  double get percentage => _percent;
}

I copied the errors that dartpad.dev gave me, into the code above as comments.

both the name and _percent fields have to be initialized now. it's saying about non-nullable types,
I'm pretty sure I read somewhere that every type in dart is an object and therefore set to null when initialized without a value.

When I use String keyword to declared name without Initialize with value it's show me error, but when I used var instead of String it's work fine.

I have make a pdf on dart if you want i can attach and make a pull request if yes reply to me
thanks

Error in Fixed-Length List Declaration:

The fixed-length list is declared incorrectly, leading to a compilation error.

List numbersList = List(5); // This line causes an error

Error: The class 'List' doesn't have an unnamed constructor.

Proposed Fix: Replace it with List<int?> numbersList = List<int?>.filled(5, null);.

Error in For-Each Loop:

There's a type mismatch in the for-each loop due to the use of nullable integers.

for (int element in numbersList) { // This line causes a type mismatch error
  print(element);
}

Proposed Fix: Change it to for (int? element in numbersList) {

Current Version of Dart SDK : 3.2.5 / 17 January 2024

Hello Sir! I am importing this project but getting errors I am just wanted to ask what is the solution for these errors one of them is not resolving pubspec.ymal file..........
Warning: You are using these overridden dependencies:
! flutter_web 0.0.0 from git https://github.com/flutter/flutter_web at c04fb5 in packages/flutter_web
! flutter_web_ui 0.0.0 from git https://github.com/flutter/flutter_web at c04fb5 in packages/flutter_web_ui

here is the code .i need help in switch case. I watched this video but I need more examples to completely understand switch case..

How can i use switch case to change bg color of listview .I want to add 10 different types of colors in listview

ListView.builder(
  itemBuilder: (BuildContext context, int index) {
    return Container(
      color: (index % 10 == 0) ? Colors.red : Colors.green,
      child: ListTile(
        title: ...
      ),
    );
  },
)