ishan16696 / design-patterns-Golang

Design patterns in Golang with implementation.

design-patterns-Golang

1. FactoryMethod

   • Define an interface for creating an object, but let subclasses/Methods decide which class to instantiate. Defer the instantiation to subclasses/Methods.

     • Interface defination:

           type Factory interface {
               NewPerson() *person
               NewAgent() *secretAgent
           }

     • Defer the instantiation to subclasses/Methods:

           fact := factory.NewFactory(config)
       
           // with factory method, we can construct the instances of both person/agent.
           person := fact.NewPerson()
           agent := fact.NewAgent()

2. Builder

   • Separate the construction of a complex object or Segregating the builder into multiple builders. It is used to construct a complex object step by step and the final step will return the object.

     •  emp1 := fact.SetName("Ishan").SetTechStack([]string{"C++", "Docker", "Go"}).BuildDev()

3. Usage of interface

   • Define an interface

     • // Action is a context-aware action.
       type Action interface {
           // Do performs an action.
           Do(ctx context.Context)
       }

   • Implements that interface

     •  // ActionFunc is a function that implements Action.
        type ActionFunc func(ctx context.Context)
       
        // Do performs an action.
        func (f ActionFunc) Do(ctx context.Context) {
            f(ctx)
        }