swiftlang/swift

[SR-6867] "Chunking" split

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#49,416 opened on Jan 29, 2018

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featuregood first issuestandard libraryswift evolution proposal needed

Description
Previous ID SR-6867
Radar None
Original Reporter @airspeedswift
Type New Feature
Votes 0
Component/s Standard Library
Labels New Feature, StarterProposal
Assignee None
Priority Medium

md5: d78e8d70fcb68ef04d5d9fac882fce1f

Issue Description:

It is possible to split a collection per element, but not by a count i.e. split an array into subsequences of length 3, or more generally any collection into subsequence of length n. There should be a ability to do this lazily for collections and eagerly for sequences.

Contributor guide

Tech stack
swift
Domain
backend
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.
half day
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
Understanding of Swift genericsFamiliarity with Sequence and Collection protocolsKnowledge of lazy sequences
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
The issue requests adding a chunking method to split collections into subsequences of a given length. The implementation should consider both eager and lazy variants. Relevant files include the standard library's Collection.swift and Sequence.swift in the swift repository. Examine existing split methods for patterns. The discussion in the issue (comment from 2018) suggests exploring lazy collection conformance. The proposal is labeled as 'StarterProposal', indicating it is suitable for newcomers with guidance. No linked PRs exist.