swiftlang/swift

[SR-3760] zip should be a collection when both arguments are a collection

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#46,345 opened on Jan 27, 2017

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 (1 comment) (0 reactions) (1 assignee)Swift (69,989 stars) (10,719 forks)batch import
affects ABIgood first issueimprovementstandard libraryswift evolution proposal needed

Description
Previous ID SR-3760
Radar rdar://problem/20751358
Original Reporter @airspeedswift
Type Improvement
Status In Progress
Resolution
Votes 0
Component/s Standard Library
Labels Improvement, AffectsABI, StarterProposal, swift-evolution-proposal-needed
Assignee dennisvennink (JIRA)
Priority Medium

md5: d1b6f411436063fefa65b78d5d22d8a2

Issue Description:

When the two things being zipped are collections, it should be possible to return a collection from zip. If they are bi-directional/random-access collections, the zipped collection should be too.

Contributor guide

Tech stack
swift
Domain
developer experienceapi
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Swift genericsSwift Collection protocolSwift evolution proposal
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Examine the current implementation of zip in the Swift standard library (likely in stdlib/public/core/). Investigate how collection conformance is currently determined and propose changes to return a Collection when both arguments are collections. Review the Swift evolution repository for any related proposals or discussions. Check the branch of the assignee dennisvennink for any in progress work. Assess the ABI impact and prepare a swift evolution proposal if needed.