JuliaLang/julia

`filter` not defined for `enumerate`

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#45,337 opened on May 17, 2022

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 (4 comments) (1 reaction) (0 assignees)Julia (5,773 forks)batch import
good first issueiteration

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Description

MWE:

a = [1,2,3]
filter(isodd, a)
map(((x,i),)->isodd(x), enumerate(a))
# errors
filter(((x,i),)->isodd(x), enumerate(a))

The problem is that filter is not defined for Any.

Contributor guide

Research direction
Implement the missing `filter` method for `enumerate` iterator. The fix likely involves adding a method in Base to handle `enumerate` and possibly other iterators that yield tuples.
Tech stack
None
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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
JuliaGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75