April 2021 1HaskellADay Problems and Solutions

• 2021-04-28: We build a recommendation-system from spotty data for today's #haskell problem. runRecs rekt the run of the ... rektrun? Bah: today's #haskell solution, with implication to the rescue!  
• 2021-04-26: Today's #haskell problem, on m̸͈̣̈́̉̉̊̈́y̴̢͌̇̕ ̷̡̗͎̰̠͚̓̈́͠B̷̙͋͊̈̕͘Į̷̻̱͔̼̙͖͚̥̄͝R̴͉̖̻̬̗͕͋̽̉̚͝T̵͈̮͙͚̤̘̦̮͐̓́̔̂͑̋̐̐̄H̶̬̳͔͔̳̀̉̇̋͒D̵̢̡̧̦̖̝͖͕͕̤̊Ȃ̷̧̩̼͔̱͙̟̺̕Y̴̡̢̮̘͛̄̽͛̆̃͌ we solve what every Gubmint agency faces every hour of the day: what does this 'TLA' stand for? Today's #haskell solution: Don't mind me. I'm just TLA'ing over here. 
• 2021-04-23: WHO WOULD WIN THIS FIGHT: Ragnarr Loðbrók or Miyamoto Musashi? Today's #haskell problem gives a bean-counter's approach, ... LITERALLY! Today's #haskell solutions shows that the winner of the Viking-Samurai deth-match is: ViewPatterns! ... obviously. 😎
  
  
  
  
  
  
• 2021-04-22: In today's #haskell exercise we try to find the opposite of Kung Fu Fighting, and we fail (because there is no opposite of awesome ... besides fail. GEDDIT?) So we try to find the dual of Kung Fu Fighting. Easy, no? "Your WuShu Praying Mantis-style is strong, but can it match my Tiger Claw-style?" Narrator: "We find out the thrilling conclusion in today's #haskell solution!" 
• 2021-04-14: In today's #haskell exercise we learn it requires 'Expert Timing' to be 'Kung Fu Fighting.' So, we have fighting; we have noodles. We have everything we need for today's #haskell solution. 
  
  
  
• 2021-04-12: For today's #haskell problem we are lifting a "plain" method into the monadic domain ... yes, I'm influenced by @BartoszMilewski writing. Why do you ask? Today's #haskell solution: Function: lifted. 
• 2021-04-09: We get all officious, ... sry: 'OFFICIAL' ... with today's #haskell problem. Today's #haskell solution shows us that you haven't met real evil until your TPS-report cover letter is ... Lorem Ipsum. 
  
  
  
• 2021-04-08, Thursday: In today's #haskell problem we optionally parse a string into some value of some type. Some how. Today's #haskell solution shows us the sum of the numbers in the string was 42 (... no, it wasn't). 
• 2021-04-07, Wednesday: decode vs. eitherDecode from Data.Aeson is today's #haskell exercise. In today's #haskell solution we find that it's nice when eitherDecode tells you why it failed to parse JSON.  
• 2021-04-05, Monday: Today's #haskell exercise is to make a vector that is Foldable and Traversable. Today's #haskell solution gives us Vectors as Foldable and Traversable. YUS! 
• 2021-04-01, Holy Thursday: In today's #haskell exercise we learn the WHOPR beat the Big Mac. We also learn how to make a safe call to an HTTPS endpoint, but that's not important as the WHOPR beating the Big Mac. "Would you like to play a game?" Today's #haskell solution says: "Yes, (safely, please)."