September 2016 1HaskellADay 1Liners Problems and Solutions

• September 15th, 2016:
  Given [1..n], create an infinite list of lists [[1.. n], [n+1 ... n+n], [n+n+1 ... 3n], ...]
  counting :: [Integer] -> [[Integer]]
• joomy @cattheory
  counting = (map . (+) . fromIntegral . length) >>= iterate
• September 30th, 2016: The reverse of August's one-liner:
  f :: (Maybe a, b) -> Maybe (a,b)
  define f. Snaps for elegance.

September 2016 1HaskellADay problems and solutions

• September 29th, 2016: Today's #haskell exercise looks at ways to get transactions from Merkle tree that DON'T involve a full-tree scan every time (given you do not know the transaction-hash, and you wish to search by user/address) #blockchain. Today's #Haskell solution transforms a Merkle tree of #bitcoin transactions into a MultiMap! 
• September 28th, 2016: TOO MANY SINGLE-LEAF NODES! Today's #haskell problem improves the insert algorithm to minimize single-leaf nodes. 
  
  
  
  
• September 27th, 2016: Today's #haskell exercise we discover a path through a Merkle tree to a hashed leaf node (a #blockchain transaction). For the #haskell solution we find #bitcoin transactions in a Merkle tree by hash 
• September 26th, 2016: For today's #haskell problem we compare two Merkle Trees, one set the same, another set slightly different. And I hope this #haskell solution doesn't get carried away into Ackermann-territory! Merkle Tree node-difference. 
  
  
  
  
• September 23rd, 2016: Today's #haskell exercise distills #bitcoin transactions, then represents them as relations. Today's #haskell solution views #bitcoin trades as graphs 
  
  
  
  
   
• September 22nd, 2016:  WHOA! WHOA! WHOA! Let's scale back the problem statement a bit, shall we? for today's #haskell exercise. Got the transactions and the addresses from the latestBlock on the #blockchain in #haskell 
• September 19th, 2016: Today's #haskell problem we create our own Merkle tree from (faux) #bitcoin transactions and then visualize it! The #haskell solution uses real #bitcoin transactions to populate then visualize a Merkle Tree as a graph structure 
   
  
   
• September 16th, 2016: Today's #haskell problem is sort of Sudoku with a BINOCULAR-twist! and what other unique 9-letter words do you know? This solution used generate-then-inline, totally avoiding testing with guards. Much faster AND correct!
• September 15th, 2016: Today's #haskell problem is neither soduko nor magic squares. And our solution was a generate-then-test with guards, can you do better?
• September 14th, 2016: For today's #haskell problem we study 'domino theory'  ... eheh. 
  
  We took the brute-force approach to solve today's #haskell problem. Do you have a better approach?
• September 12th, 2016: Today's #haskell problem is a logic puzzle of infinities and infinitesimals … Not really, but it has a ring to it!
• September 9th, 2016: For today's #haskell problem with go on a little cryptoarithmetic-romp. And I got to use the word 'romp' in a tweet. A little bit of monadic combine; a little bit of sortBy (compare `on` snd) and we have our AFTER(SHOCK)ING #haskell solution 
• September 8th, 2016: Today's #haskell exercise asks you to create a (balanced) Merkle tree from block summaries from the #blockchain. We insert some blocks from the #blockchain to create a (balanced) Merkle tree for today's #haskell solution 
• September 6th, 2016: For today's #haskell exercise we read in an entire block (with its transactions) of the #blockchain. You want all the transactions of a blockof the #blockchain? Today's #haskell solution gives them to you
• September 5th, 2016: For today's #haskell problem we begin to deconstruct blocks of the #blockchain by parsing block transactions. FromJSON instance definitions in #haskell allow us to parse transactions of blocks in the #blockchain 
• September 2nd, 2016: Today's #haskell problem we look at reading in just one block of the #blockchain. Today's #haskell solution fetches the latest block from the #blockchain thanks to https://blockchain.info 
• September 1st, 2016: Today's #haskell exercise gives us a rudimentarily-constructed Merkle Tree. Today's #haskell solution we create leaves and branches of Merkle trees (and a very simple tree sample) #bitcoin