- 2021-01-28: Opposite problem:

You have: [(a, Set b)]

you want: [(a, b)]

e.g.: [("hi", fromList [1,2,3]), ("bye", fromList [4,6,7]) ->

[("hi",1),("hi",2),("hi",3),("bye",4),("bye",6),("bye",7)]

Interestingly, Set is not a Monad. wut. How do you get around that problem? - D Oisín Kidney @oisdk (>>= traverse toList)
- mine: concatMap (sequence . second Set.toList)
- 2021-01-28:

We have [(Set a, b)]

we want [(a, b)]

where each element of Set a is paired with b, e.g.:

[(fromList [1,2,3], 'a'), (fromList [4,5,6], 'b')]

becomes

[(1,'a'),(2,'a'),(3,'a'),(4,'b'),(5,'b'),(6,'b')] - Steve "wash your hands" Trout @strout:

concatMap (uncurry (liftA2 (,)) . bimap toList pure) - insatiable mask wearer @tim_1729

[(a,b) | (s,b) <- xs, a <- (toList s)] - Today, 2021/01/21, is:
- Can be written with only 3 digits, What other dates can be so written? Also:
- a day where the month and day are NOT amalgamation the year. But which dates are amalgamations?

## Thursday, January 21, 2021

### January 2021 1HaskellADay 1Liners

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