gleam-lang/gleam

Lift literal expressions to top-level constants in JavaScript code generation

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#4,090 opened on Dec 17, 2024

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help wanted

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Description

  1. make a massive list in gleam

you can use gleam csv package to turn a csv file to gleam list then do io.debug(parssed_csv)

  1. make the list be let list = [ // here will be the long list ]

  2. do some computation to the data for me it was getting a specific element from the list

  3. change the list from let list = to const list

(make sure its a process that would take 1 or more seconds so you can notice the difference visually)

i noticed this in a lustre application i needed to get the element number 34 from list number 77 this took 4 seconds just by changing the list to const it was instant

( the version this happened on was 1.5 iirc it good to test if it still happens now )

Contributor guide

Research direction
Identify where literal expressions are compiled in the JavaScript backend and ensure they are emitted as const declarations instead of let.
Tech stack
javascript
Domain
performance
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.
Half day
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
None
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70