`groupBy` has unexpected `l` argument for `a -> a -> Boolean` predicate
Nobody has claimed this yet.
- #230 by @JordanMartinez — closed without merging
Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 25/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Domain
- backend
Research direction
Start with the linked try.purescript.org example and inspect the groupBy implementation and its tests to trace how the predicate arguments are chosen. The report expects adjacent pairs (0, 1) and (1, 2) for [0, 1, 2]; determine whether the behavior is unintended, then add a regression test and confirm it passes if a change is warranted.
Written by the indexing model from the issue text.
Description
See https://try.purescript.org/?gist=26968458c1261226b33e574128ba9aae
For a given array like [0, 1, 2], I expect the l and r arguments to be
- first run:
0and1 - second run:
1and2
However, in the second run, l is 0 rather than 1.
I'd argue that the behavior here is unexpected.
- Dominant language
- PureScript
- Stars
- 58
- Forks
- 70
- Avg merge
- 2d 22h
- Merged PRs (30d)
- 1
Getting set up
- No Dockerfile or Docker Compose file
- Has a pull request template
- No contributing guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
More from purescript/purescript-arrays
-
Difficulty 1/5 Under an hour Newbie friendliness 55/100
purescript/purescript-arrays#246 ·
-
generate functionOpen
Difficulty 2/5 1-3 hours Newbie friendliness 35/100
purescript/purescript-arrays#244 · 2 comments ·
-
Difficulty 4/5 3-5 days Newbie friendliness 35/100
purescript/purescript-arrays#242 · 2 comments ·
-
Difficulty 4/5 3-5 days Newbie friendliness 35/100
purescript/purescript-arrays#241 ·
-
type: enhancement
Difficulty 4/5 3-5 days Newbie friendliness 30/100
purescript/purescript-arrays#215 · 3 comments ·
All issues in purescript/purescript-arrays
Similar issues
-
Difficulty 2/5 1-3 hours Newbie friendliness 70/100
-
good first issue help wanted
Difficulty 2/5 1-3 hours Newbie friendliness 80/100
Maintainers usually reply within 1 day
-
bug good first issue
Difficulty 2/5 1-3 hours Newbie friendliness 85/100
Maintainers usually reply within 1 day
-
bug
Difficulty 2/5 1-3 hours Newbie friendliness 72/100
Maintainers usually reply within 1 day
-
Difficulty 2/5 1-3 hours Newbie friendliness 62/100
milind-soni/OpenMausBot#5829 ·
Maintainers usually reply within 1 day