Flutter Design Patterns: 1 — Singleton

In this article, we will explore the Singletons In Flutter. We will see how to implement a demo program and we are going to learn about how we can to use it in your flutter applications.

Singleton is a class in object-oriented programming which have a single item (an occurrence of the class) at a time. This class provides a way to access its only object which can be accessed directly without the need to instantiate the object of the class.

What Is a Singleton?

How To Implement a Singleton In Dart:

Conclusion

What Is a Singleton?

Singleton is a creational design pattern that guarantees that a class has just a single instance and gives it a global point of access. Now and then a class must have precisely one instance, or you could compel your application into a weird state.

In other words, the singleton design is a software design pattern that limits the instantiation of a class to one “single” instance.

The singleton pattern tackles issues by permitting it to:

• Ensure that a class only has one instance
• Easily access the sole instance of a class
• Control its instantiation
• Restrict the number of instances
• Access a global variable

Singleton is viewed as one of the most straightforward plan designs yet it is additionally a simple one to misunderstand if you don’t watch out. A few classes must have precisely one instance.

How To Implement a Singleton In Dart:

By making the constructor private, we guarantee that the class can’t be started up external the file where it is characterized. What’s more, thus, the best way to get to it is to call SingletonClass.instance in our code.

class DemoClass {
 static DemoClass? _instance;
/// private constructor
  DemoClass._();
  static DemoClass get instance => _instance ??= DemoClass._();
}

Creating global variable in global class

singleton = DemoClass.instance;

Conclusion:

In the article, I have explained Singleton’s basic structure in a flutter; you can modify this code according to your choice. This was a small introduction to Singletons On User Interaction from my side, and it’s working using Flutter.

I hope this blog will provide you with sufficient information on Trying the Singletons in your flutter projects. We will show you what the Singletons are. Singletons make it simple to get to dependencies in your code.

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