abstract

Missing abstract data types for Go

We've already got generic type-safe slices and maps since Go 1.21, but we want more.

Sub packages provided here share some common patterns:

• no third-party dependencies (except golang.org/x packages),
• provides alternative constructors for custom types:
  • heaps.NewFunc[MyType](myLessFunc)
  • skiplists.NewFunc[MyType](myCmpFunc)
• provides Reverse methods for ordered sequences, to be used for reversion ordinary
  • heaps.New[string].Reverse()
  • skiplists.New[int].Reverse()
• (most) methods could be chained:
  • sets.New[float64](1,2,3,4,5).Union(sets.New(1,3,5,7,9)).Unset(1).Map(math.Sqrt)
  • heaps.New[float64]().Reverse().Push(9).Push(1)
• provides Clone methods to get a deep copy of the original one,
• provides experimental Iterators, see below for usage and development guides.

Roadmap

• set
• heap
• list
• skip list
• ring
• stack?
• queue?
• chainable maps?
• chainable slices?

Usage

go get github.com/houz42/abstract@latest

If you want to try the experimental iterator and range func features, set environment variable GOEXPERIMENT=rangefunc before running any go command:

GOEXPERIMENT=rangefunc go install my/program
GOEXPERIMENT=rangefunc go build my/program
GOEXPERIMENT=rangefunc go test my/program
GOEXPERIMENT=rangefunc go test my/program -bench=.

See the range func wiki for more details.

Development

To develop with the experimental features, follow the gist to install gotip and least gopls and configure vs code.