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(Haskell) Haskell 99 Problems - Problem 23 - rtperson

Sat, 10 Sep 2011 07:27:49 GMT

problem 23, Extract a given number of randomly selected elements from a list. Example: Prelude System.Random>rnd_select "abcdefgh" 3 >>= putStrLn "eda" Two problems: 1) How to return a list, and 2) how to sample without duplication

(Haskell) Haskell 99 Problems, numbers 1 through 9 - rtperson

Thu, 08 Sep 2011 00:23:54 GMT

I had originally started these problems from #10 (Run-length encoding). I went back and did 1-8 for completeness.

(Haskell) Haskell 99 Problems - Number 20, Arrowed! - rtperson

Thu, 25 Aug 2011 01:54:30 GMT

problem 20, (*) Remove the K'th element from a list *Main> removeAt 1 "abcd" "acd" Trivial using a pure function. A bit more challenging if you use this problem to work up your Arrow-fu.

(Haskell) Haskell 99 Problems - Number 18 and 19 - rtperson

Sun, 21 Aug 2011 01:58:02 GMT

Problem 18: Extract a slice from a list. Given two indices, i and k, the slice is the list containing the elements between the i'th and k'th element of the original list (both limits included). Start counting the elements with 1. Example: *Main> slice ['a','b','c','d','e','f','g','h','i','k'] 3 7 "cdefg 9 Problem 19 - Rotate a list N places to the left. *Main> rotate ['a','b','c','d','e','f','g','h'] 3 "defghabc" *Main> rotate ['a','b','c','d','e','f','g','h'] (-2) "ghabcdef" (This one is so easy it feels like cheating...)

(Haskell) Haskell 99 Problems - Number 17 - rtperson

Thu, 18 Aug 2011 06:50:09 GMT

problem 17, Split a list into two parts; the length of the first part is given. Do not use any predefined predicates. (Meaning no splitAt or take or drop) *Main> split "abcdefghik" 3 ("abc", "defghik")

(Haskell) Haskell 99 Problems - Numbers 15 and 16 - rtperson

Thu, 18 Aug 2011 03:59:30 GMT

problem 15, Replicate the elements of a list a given number of times. > repli "abc" 3 "aaabbbccc" problem 16, Drop every N'th element from a list. *Main> dropEvery "abcdefghik" 3 "abdeghk"

(Haskell) Run-Length Encoding in Haskell - rtperson

Fri, 29 Jul 2011 06:08:49 GMT

Problem 10 of the famous 99 Problems. I got 99 problems, but a Lisp ain't one.