Add partitioning functions to Data.List
The functions take
and span
have recursive equivalents takeRec
and spanRec
that apply the same function to the remainder, i.e.
takeRec i xs = let (hs,ts) = splitAt i xs in hs : takeRec i xs
spanRec p xs = let (hs,ts) = span p xs in hs : spanRec p xs
and the more generic version of take
:
genericTakeRec i xs = let (hs,ts) = genericSplitAt i xs in hs : genericTakeRec i xs
These functions, to me, are in the same league as partition
and group
, can be added with little chance of nameclashes on functions with a different meaning and are not named compositions.
Trac metadata
Trac field | Value |
---|---|
Version | 6.12.1 RC1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |