list utilities -- shouldn't these be in the hierarchical libs somewhere?
I found http://haskell.cs.yale.edu/haskell-report/List.html had many useful "one off" type list functions such as "subsequences" and "permutations" which are nowhere to be found in hoogle, Data.List, or the haskell hierarchical libs Shouldn't these be included somewhere? thomas. --- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.
Thomas Hartman wrote:
I found
http://haskell.cs.yale.edu/haskell-report/List.html
had many useful "one off" type list functions such as "subsequences" and "permutations" which are nowhere to be found in hoogle, Data.List, or the haskell hierarchical libs
Weird. It's not very many. Other that those, I spotted: sums, products, elemIndexBy, elemBy. I have no idea why they were removed between that version of the report and haskell98. Jules
Jules Bean wrote:
Thomas Hartman wrote:
I found
http://haskell.cs.yale.edu/haskell-report/List.html
had many useful "one off" type list functions such as "subsequences" and "permutations" which are nowhere to be found in hoogle, Data.List, or the haskell hierarchical libs
Weird.
It's not very many. Other that those, I spotted: sums, products, elemIndexBy, elemBy.
I have no idea why they were removed between that version of the report and haskell98.
For the ones you mention: - sums, products: The names don't make it clear what they do, I could for instance imagine sums being 'map sum'. And should it be a 'scanl' or 'scanr'? - elemIndexBy, elemBy: elemBy f x = any (f x) elemIndexBy f xs x = findIndex (f x) xs On the other hand, I would love to see "subsequences" and "permutations" added to Data.List. In fact, I made a library proposal to make this happen, hopefully they will be added to the standard library soon. Twan
participants (3)
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Jules Bean -
Thomas Hartman -
Twan van Laarhoven