How to use and implement useContext()

Flutter is a highly regarded cross-platform framework for building impressive and robust mobile and web applications.

Here are some tips and tricks to help you make the most out of Flutter if you're a beginner developer getting started with it . 

1.Use the keyword "final":

"In Dart, variables that are initialized and cannot be modified are declared using the 'final' keyword. Your code will become more predictable, and this helps prevent errors."

final String name = 'Simple App'; 
name = 'Simple App''; // Error: The final variable 'name' can't be assigned a value.

In this example, we declare a variable 'name' and assign it the value 'Simple App.' Since 'name' is declared as 'final,' we cannot assign it a new value . 

2.Use named parameters:

Using named parameters in function calls is supported in Dart, which can enhance the readability and understanding of your code.

You have more control over the order in which arguments are passed to functions when using named parameters.

void greet({String name, int age}) {
  print('Hello, $name! You are $age years old.');
}
void main() {
  greet(name: 'John', age: 30); // Utilisation des paramètres nommés
  greet(age: 25, name: 'Jane'); // L'ordre des paramètres peut être modifié
}

In this example, the 'greet' function takes two named parameters: 'name' and 'age.' When calling the function, you can specify the parameter values in any order using the syntax paramName: value. This makes the code more readable and allows for clear specification of which argument is associated with which value . 

3.Use NULL-accepting operators:

Dart provides several null-aware operators that can make your code shorter and more productive.

For example, you can safely access properties of an object that might be null using the ' ? ' operator:

class Person {
  final String name;
  final int age;
  
  Person({this.name, this.age});
}

final person = Person(name: 'Snehal Singh', age: null);

final name = person?.name ?? 'Unknown';
final age = person?.age ?? -1;

print(name); // Snehal Singh
print(age); // -1

 

In this example, we define a Person class with two properties, name and age. We create an instance of Person and assign the value null to the age property. Then, we use the null-aware operator ?. to safely access the name and age properties, and the null coalescing operator ?? to provide default values in case they are null.

4.Use extension methods:

Using method extensions, Dart allows you to add new methods to classes that already exist.

This can be useful if you want to extend the functionality of a class without modifying its source code

extension StringExtension on String {
  bool get isPalindrome {
    final reversed = this.split('').reversed.join('');
    return this == reversed;
  }
}

print('racecar'.isPalindrome); // true
print('hello'.isPalindrome); // false

In this example, we define a method extension isPalindrome on the String class. The method checks if the string is a palindrome and returns true or false. 

5.Use async/await:

Asynchronous programming is supported in Dart through the 'async' and 'await' keywords.

This allows you to write more responsive code that doesn't block the user interface (UI) thread

Future<void> main() async {
  print('Fetching data...');
  final data = await fetchSomeData();
  print('Data received: $data');
}

Future<String> fetchSomeData() async {
  await Future.delayed(Duration(seconds: 2)); // Simulate network delay
  return 'Hello'
}

In this example, we define a 'main' function marked as asynchronous. Inside 'main,' we call a function 'fetchSomeData' using the 'await' keyword. This tells Dart to wait for the 'fetchSomeData' function to complete before continuing the execution of the rest of the 'main' function. 'fetchSomeData' simulates a network delay using the 'Future.delayed' function and returns a string.

When we run the 'main' function, we start by displaying a message in the console indicating that we are fetching data. Then, we call 'fetchSomeData' and wait for its completion before displaying the received data in the console

6.Use the cascade operator:

The cascade operator (..) in Dart allows you to chain multiple method calls on the same object.

Your code can thus become clearer and easier to read.

class Person {
  String name;
  int age;
  
  void sayHello() {
    print('Hello, my name is $name and I am $age years old');
  }
}

final person = Person()
  ..name = 'Snehal Singh'
  ..age = 30
  ..sayHello(); // Hello, my name is Snehal Singh and I am 30 years old

In this example, we define a Person class that has two properties, name and age, as well as a sayHello method. We create an instance of Person and use the cascade operator (..) to set the name and age properties and call the sayHello method in a single chain of method calls.