haskell/vector

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An efficient implementation of Int-indexed arrays (both mutable and immutable), with a powerful loop optimisation framework .

Stars: 401
Forks: 145
Open beginner issues: 1
Indexed issues: 49

Dominant language: Haskell
License: No license data
Last GitHub push: Jun 23, 2026
Latest indexed: Sep 14, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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`Size` can be a newtype. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

haskell/vector#569 · Opened Sep 6, 2026
fromListN documentation: clarify (or remove?) "It's expected that the supplied list will be exactly n elements long" Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

haskell/vector#565 · 1 comment · Opened Jun 13, 2026
Backpermute needn't have the same index container Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

haskell/vector#563 · 1 comment · Opened Jun 9, 2026
`Vector` constructor is not exposed. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

haskell/vector#560 · 1 comment · Opened Apr 16, 2026
Unbox Complex should use one array. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#554 · Opened Nov 9, 2025
Remove benchmarks sublibrary. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#550 · 7 comments · Opened Sep 18, 2025
Use of sublibrary problematic, due to GHC bug #25025 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#527 · 2 comments · Opened Apr 2, 2025
Newtypes DoNotUnboxLazy / DoNotUnboxStrict / DoNotUnboxNormalForm lack Generic instances Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

haskell/vector#520 · 1 comment · Opened Dec 21, 2024
Feat: add `prevPermutation`, `nextPermutationBy` and a version of `nextPermutation` that goes back to the first perm? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#499 · 7 comments · Opened Jul 21, 2024
unboxed Vector Bool seems to be 40 times slower than unboxed Array Int Bool Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#495 · 15 comments · Opened Jun 26, 2024
Adding more `HasCallStack` s Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#494 · 3 comments · Opened Jun 8, 2024
Add total counterparts to partial functions, such as `head`. Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

haskell/vector#479 · 29 comments · Opened Jan 22, 2024
Semantics and implementation of move for SoA vectors Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#472 · Opened Nov 17, 2023
Split generic tests into separate package Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#459 · 5 comments · Opened Apr 16, 2023
Improve compilation time Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#458 · 3 comments · Opened Mar 11, 2023
Add a variant unfoldrExactN, returning the resulting generator Open

help-wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#447 · 3 comments · Opened Aug 18, 2022
overlaps for Data.Vector.Mutable behaves oddly for empty vectors Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#444 · 2 comments · Opened Jul 19, 2022
High level documentation? Open

documentation help-wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#443 · 2 comments · Opened Jul 18, 2022
Improve documentation and refactor `copy` + `move` in mutable APIs Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

haskell/vector#440 · 1 comment · Opened Jul 8, 2022
Adding `intersperse` to the API Open

help-wanted

Difficulty 5/5 Over a week Newbie friendliness 30/100

haskell/vector#421 · 2 comments · 1 reaction · Opened Nov 14, 2021
unstreamM etc destroys performance; expose unstreamPrimM & document most-performant method Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

haskell/vector#416 · 13 comments · 1 reaction · Opened Sep 11, 2021
Overflow in size hints in bundles Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

haskell/vector#406 · 2 reactions · Opened Aug 13, 2021
Length in unboxed instances Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#393 · 12 comments · Opened Jul 20, 2021
Resize operation Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#392 · Opened Jul 17, 2021
Allocation strategies for vector creation Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

haskell/vector#388 · 14 comments · Opened May 23, 2021
Discussion: High-level functions that can convert between vector types Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

haskell/vector#373 · 7 comments · Opened Mar 27, 2021
Generic.takeWhile is not copy-free Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#330 · 16 comments · Opened Aug 30, 2020
Clarify the drawbacks of unsafe functions Open

documentation help-wanted

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

haskell/vector#305 · 4 comments · 4 reactions · Opened May 8, 2020
Memory safety in vector Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#298 · 2 comments · Opened Feb 3, 2020
Improve documentation, reduce duplication and add examples to haddock Open

documentation help-wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#296 · 10 comments · Opened Feb 2, 2020
reproducer for test suite blowup to hand off to ghc folk Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

haskell/vector#280 · 3 comments · Opened Jan 31, 2020
Inlining functions of Unboxed vector consumes a lot of memory Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

haskell/vector#274 · 8 comments · Opened Jan 30, 2020
The Bundle datatype seemingly doesn't need the field sVector Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#269 · 14 comments · Opened Jan 26, 2020
Question about the performance of fused vector operations Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

haskell/vector#259 · 10 comments · Opened Nov 21, 2019
Unboxed is not a good default unboxed vector Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#250 · 34 comments · 1 reaction · Opened Jun 28, 2019
Add uniquely named type aliases for each Vector type to `Data.Vector.Generic` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#240 · 7 comments · Opened Apr 5, 2019
Add note about sorting to documentation (and possibly a transform function) Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

haskell/vector#232 · 5 comments · 2 reactions · Opened Dec 13, 2018
Add vector version of mapAccumL that behaves like the list version Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#228 · 23 comments · 1 reaction · Opened Nov 8, 2018
unstreamM fusion incredibly easy to break Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#208 · 1 comment · Opened Apr 12, 2018
lists vs pure vector vs monadic vector stream performance benchmarks Open

help-wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#207 · 1 comment · 1 reaction · Opened Apr 6, 2018
add rotations Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

haskell/vector#189 · 2 comments · Opened Dec 10, 2017
(Unboxed.Vector Char).takeWhile is much slower then Data.Text.takeWhile Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

haskell/vector#182 · 3 comments · Opened Jul 23, 2017
Using mutable and immutable vectors together is painful Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#159 · 6 comments · Opened Mar 25, 2017
Consider design change in light of GHC join point work Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

haskell/vector#156 · 38 comments · Opened Feb 21, 2017
DV.Generic.Mutable.fill does not check for out of bounds access Open

bug design-shed

Difficulty 4/5 3-5 days Newbie friendliness 25/100

haskell/vector#118 · 10 comments · Opened Jun 10, 2016
Possible Changes to Bundle.Chunk? Open

design-shed enhancement question

Difficulty 5/5 Over a week Newbie friendliness 25/100

haskell/vector#91 · 4 comments · Opened Aug 6, 2015
basicOverlaps is pretty weak Open

bug design-shed enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#88 · 1 comment · Opened Jul 25, 2015
Add insertion functions Open

design-shed enhancement

Difficulty 4/5 3-5 days Newbie friendliness 38/100

haskell/vector#76 · 1 comment · Opened Feb 23, 2015
Vector analog of peekArray Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

haskell/vector#68 · 14 comments · Opened Jan 22, 2015

haskell/vector

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