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Singleton in Ruby

Singleton is a creational design pattern, which ensures that only one object of its kind exists and provides a single point of access to it for any other code.

Singleton has almost the same pros and cons as global variables. Although they’re super-handy, they break the modularity of your code.

You can’t just use a class that depends on a Singleton in some other context, without carrying over the Singleton to the other context. Most of the time, this limitation comes up during the creation of unit tests.



Usage examples: A lot of developers consider the Singleton pattern an antipattern. That’s why its usage is on the decline in Ruby code.

Identification: Singleton can be recognized by a static creation method, which returns the same cached object.

Singleton in Other Languages

Singleton in C# Singleton in C++ Singleton in Go Singleton in Java Singleton in PHP Singleton in Python Singleton in Rust Singleton in Swift Singleton in TypeScript