How to write a generic collection type in Go: 2 wrong ways and the right way.

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Awesome Go

The author outlines the challenges and solutions encountered while attempting to implement a generic collection type in Go. Despite the release of Go generics in version 1.18, comprehensive documentation and practical guides were missing, leading to numerous errors and false starts. By exploring different approaches and deeply researching type constraints and interfaces, the author ultimately formulates a working implementation for a sortable Set collection. Key takeaways include avoiding multiple type parameters, correctly using the 'comparable' constraint, and thoroughly understanding the type set declarations.

Writing generic collection types in Go: the missing documentation

What we want to build: a sortable Set of any type

False start #1: Use two generic type parameters, copying slices.Index

False start #2: self-referential type definition without comparable

The secret syntax of generic type constraints