February 2019 1HaskellADay Problems and Solutions

• February 20th, 2019: Wednesday's #haskell problem: we've got words, now let's find words that start with ... 'x'. 
• February 19th, 2019: Tuesday's #haskell problem: now that we have a word finder, let's pretty-print the results! 
• February 18th, 2019: Monday's #haskell problem is to come up with sets of wordsusing only a set of supplied letters. Monday's #haskell solution has some trickiness around empty sets: this, we call 'fun.' 

April/May 2019 1HaskellADay 1Liners

• May 27th, 2018:
  data F = F { a, b, c :: String }
  data Stamped a = { time :: Day, stamped :: a }
  
  f :: Stamped F -> String
  
  output of f x is  "time a b c" for the respective values of time, a, b, c
  
  Is there some monadic / applicative elegant definition that does this?
• Nickolay Kudasov @crazy_fizruk
  f = intercalate “ “ . sequence [ show.time, a.stamped, b.stamped, c.stamped ]
• Nickolay Kudasov @crazy_fizruk
  f = intercalate " " <$> http://pure.show .time <> (sequence [a, b, c]).stamped
  A bit trickier, but shorter and uses stamped once.
• April 13th, 2018: given f :: [a] -> b -> [c]
  where c is a derived from g :: a -> b -> c
  
  You have [a] and [b]
  
  Write a function h :: [a] -> [b] -> [c] from f

January 2019 1HaskellADay Problems and Solutions

• January 30th, 2019: Wednesday's #haskell problem is to take the JSON-y articles and the HTML-encoded articles and sort them by id and by date. 
• January 29th, 2019: For Tuesday's #haskell problem we convert JSON-like strings to valid HTML strings, handling irregularities (gracefully!) in the input data as we go. For Tuesday's #haskell solution we convert text to text when you're not sure of the structure a priori. 
• January 28th, 2019: Hello, Haskellers! Happy New Year! Monday's #haskell problem is a little warming-up JSON parsing exercise to get back into the swing of things. Monday's #haskell solution uses the Data.Aeson library to parse the JSON into Haskell data structures. 

December 2018 1HaskellADay Problems and Solutions

• December 19th, 2018: Tuesday's #haskell problem was to eliminate that pesky plus-sign; Wednesday's haskell problem is to enputify it back in! A solution of enputification.
• December 18th, 2018: Tuesday's #haskell problem is to sum a set of integers from file ... except the integers are stored with a novel representation. Tuesday's #haskell solution eliminates that pesky plus-sign, and, doing that, you get yourself a gold star from the adventofcode.com  
  
• December 5th, 2018: Wednesday's #haskell problem: from KAYAK to ULULU, generalizing the palindrome-grid puzzle. Wednesday's #haskell solution: ULULU, RADAR, or any word you want can be engridified (that's a word, now) 
  
• December 4th, 2018: Tuesday's #haskell problem is to find 5-letter palindromes in your word dictionary. Tuesday's #haskell solutions finds 'ULULU'! Now, that's another KAYAKescque word! 
• December 3rd, 2018: Monday's #haskell problem is scanning a sea of A's, K's, and Y's for a KAYAK.  Monday's #haskell solution is a kayak found, now that I remember where I placed it. 

November 2018 1HaskellADay Problems and Solutions

• November 27th, 2018: Tuesday brings a little more logic to today's #haskell puzzler. 
  
• November 26th, 2018: Monday's #haskell problem: J'ACCUSE! 
• November 23rd, 2018: A little late, but here's a little logic puzzle to solve using #haskell on a frigid Friday. That took a couple of iterations, but BOOM! a #haskell solution to Friday's little logic puzzle. 
  
• November 22nd, 2018: Thursday's #haskell problem is from @fermatslibrary: we throw enough 1/4th together and we get 1/3. Trust me on this one. 
  
• November 21st, 2018: From @fermatslibrary comes Wednesday's #haskell problem For Wednesday's #haskell solution: π and e as an equality? How transcendent! ... eheh. 😎 
  
• November 5th, 2018: Monday's #haskell problem: rectangular numbers from a calculator face are all divisible by 11. True? The #haskell solution shows that yes, it is true! 
  
   
• November 2nd, 2018: From @fermatslibrary comes Friday's #haskell problem: twoSquaresDifference of any odd number. Friday's #haskell solution we are folding odd numbers to find their diff squares. 

October 2018 1HaskellADay Problems and Solutions

• October 31st, 2018: A Happy Halloween arithmetic puzzle for you Happy Haskellers! 
• October 25th, 2018: Thursday's #haskell problem we have a (Loopful) compiler for BF* Thursday's #haskell solution: A BF* compiler, blocks of code in loops working. 
• October 24th, 2018: Wednesday's #haskell problem: Thus we enter the Turing Tarpit! The solution to Wednesday's #haskell problem is a BF* (loopless) interpreter that prints out "Hello, world!" I didn't think I could reach the pinnacle of programming in my lifetime, yet, here I am. 😎 
• October 19th, 2018: For Friday's #haskell problem we look at patterns in how people define categories: a little knowledge management. 
  
• October 17th, 2018: For Wednesday's #haskell problem we are using Haskell to automate writing a set of SQL INSERT statements. The function addDays to Wednesday's #haskell problem's rescue! 
  
• October 15th, 2018: Monday's #haskell problem is a little asset shell-game. A little Set.union, a little Set.difference, to get today's #haskell solution. 
• October 9th, 2018: Tuesday's #haskell problem: given a set of ids and our knowledge store from yesterday, determine the status of the new ids. Tuesday's #haskell solution: a Set to determine membership, and a Map to give the result, with a little bit of Frege-logic for fun! 
• October 8th, 2018: Monday's #haskell problem is random screening (okay: predetermined screening). Monday's #haskell solution: indexing into a list often? Consider the Array-type. 
• October 5th, 2018: Friday's #haskell problem we create a workflow to process chunks of files as SQL INSERT statements. And lo! and behold! A #haskell solution to all our problems... or today's problem, anyway. 
  

August 2018 1HaskellADay problems and solutions

• August 22nd, 2018: For Wednesday's #haskell problem we query a directory and massage some JSON: all in a day's work. Wednesday's #haskell solution: Processing JSONs ... LIKE A BOSS! 
• August 20th, 2018: For Monday's #haskell problem we distill UUIDs encoded in news media URLs. Monday's #haskell solution uses the break function FTW! 
• August 16th, 2018: For Thursday's #haskell problem we have Zipf's Law and words-in-sentences: a [The Current Year] analysis. 
• August 15th, 2018: For Wednesday's #haskell problem, we look at the 5000 most frequently used English words and do a bit of analysis. Wednesday's #haskell solution gets us the top 5000 English language words and their counts. 
• August 3rd, 2018: For Friday's #haskell problem we ingest JSON to discover its structure.