z-pattern-matching/z

Multi-Character global condition match failure

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#61 opened on Jan 28, 2020

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 (0 comments) (0 reactions) (0 assignees)JavaScript (1,714 stars) (78 forks)batch import
bughelp wanted

Description

I'm running into what may be a conceptual issue rather than an actual issue. Are multi-character match variables supported?

E.g.

let string = "test"; match(string)( (s) => { console.log(s); } )

Executes as expected logging

test

but

let string = "test"; match(string)( (str) => { console.log(str); } )

generates no output.

Contributor guide

Tech stack
javascript
Domain
developer experience
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.
under 1 hour
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.
mostly clear
Prerequisites
familiarity with JavaScriptbasic understanding of the z library
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80
Research direction
The issue describes a bug where the match function fails to execute when the variable name in the matcher has more than one character (e.g., 'str' vs 's'). To reproduce, use a multi character variable name in the match callback; single character names work. The root cause likely lies in the pattern matching parser or the way variables are extracted from function parameters. Investigate the source code, particularly the match function implementation and any regex or string manipulation that might be limited to single characters. Since the issue is from 2020, first verify if the bug still exists in the current version by testing locally or checking recent commits. If confirmed, a fix would involve adjusting the parameter extraction logic to support multi character variable names.