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Template Method is a behavioral design pattern that allows you to define a skeleton of an algorithm in a base class and let subclasses override the steps without changing the overall algorithm’s structure. Golang Implementation Example: One Time Password (OTP) Functionality Let’s consider the example of One Time Password (OTP) functionality. There are different ways that the OTP can be delivered to a user (SMS, email, etc.). But irrespective whether it’s an SMS or email OTP, the entire OTP process is the same:

Iterator is a behavioral design pattern that allows sequential traversal through a complex data structure without exposing its internal details. Thanks to the Iterator, clients can go over elements of different collections in a similar fashion using a single iterator interface. Golang Implementation Example: The main idea behind the Iterator pattern is to extract the iteration logic of a collection into a different object called iterator. This iterator provides a generic method of iterating over a collection independent of its type.

Command is behavioral design pattern that converts requests or simple operations into objects. The conversion allows deferred or remote execution of commands, storing command history, etc. Golang Implementation Example: TV Remote Let’s look at the Command pattern with the case of a TV. A TV can be turned ON by either: ON Button on the remote; ON Button on the actual TV. We can start by implementing the ON command object with the TV as a receiver.

Mediator is a behavioral design pattern that reduces coupling between components of a program by making them communicate indirectly, through a special mediator object. The Mediator makes it easy to modify, extend and reuse individual components because they’re no longer dependent on the dozens of other classes. Golang Implementation Example: Railway Station Traffic System An excellent example of the Mediator pattern is a railway station traffic system. Two trains never communicate between themselves for the availability of the platform.