JuliaCollections / JuliaCollections/DataStructures.jl
`DefaultDict` and `haskey`
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Description
I didn't find a conversation around whether haskey should always return true for DefaultDict.
julia> using DataStructures: DefaultDict
julia> d1 = DefaultDict(0, :A=>1, :B=>2)
DefaultDict{Symbol,Int64,Int64} with 2 entries:
:A => 1
:B => 2
julia> haskey(d1, :C)
false
julia> d1[:C]
0
This would make it inconsistent with keys, but consistent with getindex.
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the DefaultDict behavior shown in the issue and review how Julia defines haskey, keys, and getindex for missing keys. Resolve the intended contract for haskey, then verify the decision with cases covering both present and missing keys.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- julia
- Domain
- data
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100