JuliaLang/julia

Add `haskey` for `Tuple`

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#35,516 opened on Apr 18, 2020

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 (7 comments) (2 reactions) (0 assignees)Julia (5,773 forks)batch import
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Description

Currently haskey is defined for NamedTuple but not for Tuple. Would it make sense to also add this for tuples? After all, keys(::Tuple) is also defined.

Code would then probably look like this

    haskey(t::Tuple, key) = isdefined(t, key)

Related: https://github.com/JuliaLang/julia/issues/32898

Contributor guide

Research direction
Implement `haskey` for `Tuple` by adding a method that uses `isdefined` to check if the tuple has a given key. Look at existing `haskey` implementations for `NamedTuple` for reference.
Tech stack
None
Domain
api
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
1
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitJulia
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
90