https://github.com/juliafolds/microcollections.jl

Immutable empty and singleton collections
https://github.com/juliafolds/microcollections.jl

arrays data-structures dictionaries immutable julia sets

Last synced: about 2 months ago
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Immutable empty and singleton collections

• Host: GitHub
• URL: https://github.com/juliafolds/microcollections.jl
• Owner: JuliaFolds
• License: mit
• Created: 2020-05-30T21:04:56.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2023-03-02T10:06:39.000Z (about 2 years ago)
• Last Synced: 2024-05-10T06:10:46.401Z (12 months ago)
• Topics: arrays, data-structures, dictionaries, immutable, julia, sets
• Language: Julia
• Homepage:
• Size: 305 KB
• Stars: 12
• Watchers: 3
• Forks: 5
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# MicroCollections

[![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://juliafolds.github.io/MicroCollections.jl/dev)

[![GitHub Actions](https://github.com/JuliaFolds/MicroCollections.jl/workflows/Run%20tests/badge.svg)](https://github.com/JuliaFolds/MicroCollections.jl/actions?query=workflow%3A%22Run+tests%22)

MicroCollections.jl provides immutable empty and singleton collections.

```julia

julia> using MicroCollections

julia> vec0()  # or EmptyVector()

0-element EmptyVector{Union{}}

julia> vec0(Int)  # or EmptyVector{Int}()

0-element EmptyVector{Int64}

julia> vec1(1)  # or SingletonVector((1,))

1-element SingletonVector{Int64}:

 1

julia> EmptyDict()

EmptyDict{Union{},Union{}}()

julia> EmptyDict{Symbol,Char}()

EmptyDict{Symbol,Char}()

julia> SingletonDict(:a => 0)

SingletonDict{Symbol,Int64} with 1 entry:

  :a => 0

julia> EmptySet()

EmptySet{Union{}}()

julia> EmptySet{Int64}()

EmptySet{Int64}()

julia> SingletonSet((1,))

SingletonSet{Int64} with 1 element:

  1

```

With BangBang.jl, MicroCollections.jl is useful for constructing

singleton solutions that can be combined with a reduce:

```julia

julia> using BangBang.Experimental: mergewith!!

julia> @assert mapreduce(

           x -> SingletonDict(abs(x) % 10 => 1), mergewith!!(+), 1:1000,

       ) == Dict(

           0 => 100,

           1 => 100,

           2 => 100,

           3 => 100,

           4 => 100,

           5 => 100,

           6 => 100,

           7 => 100,

           8 => 100,

           9 => 100,

       )

```