JuliaLang/julia

implement String(::Base.Generator)

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#57,072 opened on Jan 16, 2025

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 (10 comments) (2 reactions) (0 assignees)Julia (48,709 stars) (5,773 forks)batch import
good first issuehelp wantedstrings

Description

I was hoping that this would work:

String(Iterators.map(c->c+1, "Hello, world"))

Instead it's a method error. We should allow the String constructor to take a generator argument.

Contributor guide

Tech stack
None
Domain
developer experience
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.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Julia language basicsunderstanding of generatorsJulia base library contribution guide
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the current definition of the String constructor in Julia's base library (likely in base/strings/). Look for methods that accept iterable arguments. Implement a new method `String(g::Base.Generator)` that converts the generator to a string. Consider performance and edge cases (e.g., empty generator). Add tests and ensure existing tests pass. Consult the contributing guidelines for Julia.