Learning Golang: Functional Options / Default Configuration Values Pattern

Описание: This is tutorial for a Go pattern, similar to the Builder pattern, that allows defining configuration values, default values and validations called: Functional Options.

This Go Pattern is possible thanks to the power of Go when defining types that happen to be functions combining them with variadic arguments in the "constructor"/initializer function using those values.

I like to use this pattern when the goals are the following:

Expressiveness, we want to clearly indicate the configuration values
Flexibility, we can add new configuration values and our users won't break
Security, we can define validation rules
Defaults, we can define values values

== Relevant Links

Example code: https://github.com/MarioCarrion/video...
Previous Episode: "Learning Golang: Versioning Tools as Dependencies using Go Modules":    • Learning Golang: Versioning Tools as Depen...  

Playlist "Learning Go":    • Learning Go/Golang  
Playlist "Software Architecture in Go":    • Software Architecture and System Design in...  
Playlist "Learning Go/Golang Concurrency Patterns"    • Learning Go/Golang Concurrency Patterns  
Playlist "Building Microservices in Go":    • Building Microservices in Golang/Go  
Playlist "GoTools and Packages":    • Golang/Go Tools and Packages  
Playlist "Testing in Go":    • Testing in Golang/Go  

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00:00 Introduction to Golang Function Options / Default Values
04:03 Extract arguments as a new type
06:46 Adding Functional Options
13:33 Adding Validation and errors
17:40 Adding Default Values
19:20 Conclusion

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Who am I:

Hello👋🏼! I'm Mario, a Hands-on Software Architect and Lead Backend Engineer with more than 16 years of professional experience building all kinds of software including on-premise Industrial Automation Systems, Linux Accessibility Desktop and Browser Components as well as Distributed Advertising Microservices.

Every week I will share with you different topics I've learned while working for small startups and large companies including the processes I've followed over the years for successfully delivering complex enterprise systems from start to end.

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