फ्लूटर (डार्ट) टिप्स शीट

int age = 30;
double price = 9.99;
String name = 'John';
bool isActive = true;
var dynamicVar = 'Can be any type';
final constantVar = 'Cannot be reassigned';
const compiletimeConstant = 'Compile-time constant';

String? nullableString;
String nonNullableString = 'Hello';

void simplePrint() {
  print('Hello');
}

int add(int a, int b) => a + b;

void namedParams({required String name, int? age}) {
  // Function body
}

void optionalParams(String name, [int? age]) {
  // Function body
}

if (condition) {
  // code
} else if (anotherCondition) {
  // code
} else {
  // code
}

for (var i = 0; i < 5; i++) {
  // code
}

while (condition) {
  // code
}

switch (variable) {
  case value1:
    // code
    break;
  default:
    // code
}

List<int> numbers = [1, 2, 3];
Map<String, int> ages = {'Alice': 30, 'Bob': 25};

class Person {
  String name;
  int age;

  Person(this.name, this.age);

  void sayHello() {
    print('Hello, I am $name');
  }
}

Future<void> fetchData() async {
  try {
    var result = await someAsyncOperation();
    print(result);
  } catch (e) {
    print('Error: $e');
  }
}

Stream<int> countStream(int max) async* {
  for (int i = 0; i < max; i++) {
    yield i;
  }
}

try {
  // Code that might throw an exception
} on SpecificException {
  // Handle specific exception
} catch (e) {
  // Handle any exception
} finally {
  // Always executed
}

int age = 30;
String name = 'John';

int? nullableAge;
String? nullableName;

String? name;
print(name?.length); // यदि नाम नल नहीं है तो लंबाई के सुरक्षित उपयोग

String? name;
String displayName = name ?? 'मेहमान';

String? name;
name ??= 'जॉन'; // यदि नाम नल है तो 'जॉन' स्थानांतरित करें

String? nullableName = 'जॉन';
String nonNullableName = nullableName!;

String? getName() => 'जॉन';

void printName() {
  String? name = getName();
  if (name != null) {
    print(name.length); // यहाँ नाम के सुरक्षित उपयोग करें
  }
}

late String lateInitializedName;
void initializeName() {
  lateInitializedName = 'जॉन';
}

void greet(String name, {String? title}) {
  if (title != null) {
    print('हैलो, $title $name');
  } else {
    print('हैलो, $name');
  }
}

List<String>? nullableList;
List<String?> listOfNullableStrings = ['हैलो', null, 'दुनिया'];

List<String?> mixedList = ['a', null, 'b', null, 'c'];
List<String> nonNullList = mixedList.whereType<String>().toList();