options

Functional Options Pattern utility for Go.

Usage

go get github.com/tingtt/options

import "github.com/tingtt/options"

• Simple one

   type Option struct {}
  
   func NewService(_options ...options.Applier[Option]) (Service, error) {
   	option := options.Create(_options...) // Create option from functional options.
  
   	service := new(service)
  
   	// effect option to service ...
  
   	return service, nil
   }

• Create option with default value

   type Option struct {}
  
   func DefaultOption() Option {
   	return Option{
   		// write default fields...
   	}
   }
  
   func NewService(_options ...options.Applier[Option]) (Service, error) {
   	option := options.CreateWithDefault(DefaultOption(), _options...) // Create option from functional options.
  
   	service := new(service)
  
   	// effect option to service ...
  
   	return service, nil
   }