Inverting a BOOL property without using dot syntax
By : Jérémie Breda
Date : March 29 2020, 07:55 AM
wish helps you In this line of code I am reversing a BOOL value: , [someObject setBoolValue:![someObject boolValue]];

Inverting List Elements in Haskell
By : Sadiya Ndayako
Date : March 29 2020, 07:55 AM
it fixes the issue Here's one way to do this: First we define a function to invert one list (if it has two elements; otherwise we return the list unchanged): code :
invertOne :: [a] > [a]
invertOne [x, y] = [y, x]
invertOne xs = xs
invert :: [[a]] > [[a]]
invert xs = map invertOne xs

Haskell: Multiproperty sort is not generic enough
By : Pop Romany
Date : March 29 2020, 07:55 AM
To fix the issue you can do Since we have Monoid Ordering and instance Monoid b => Monoid (a > b) in Prelude, we also have Monoid (a > a > Ordering) by iterating the function instance twice. This lets us solve the issue quite simply, without existentials: code :
import Data.Ord (Ordering, comparing)
import Data.List (sortBy)
import Data.Monoid ((<>), mconcat)
data Row = Row {
shortListed :: Bool,
cost :: Float,
distance1 :: Int,
distance2 :: Int
} deriving (Show, Eq)
asc, desc :: Ord b => (a > b) > a > a > Ordering
asc = comparing
desc = flip . asc
list :: [Row]
list = [Row False 0 10 20, Row True 10 30 40]
list' :: [Row]
list' = sortBy (asc shortListed <> desc cost <> asc distance1) list
orderBy :: [a > a > Ordering] > [a] > [a]
orderBy = sortBy . mconcat
list'' :: [Row]
list'' = orderBy [asc shortListed, desc cost, asc distance1] list

Sort by elements in multiple layers of multilayered tuple  Python
By : XuanYu Wang
Date : March 29 2020, 07:55 AM
help you fix your problem I have a tuple of tuples of tuples and I want to sort it first by the second element, then first, then third of the lowermost layer and iteratively do this for each tuple of the middle layer. , Try this: code :
sortedSample = sorted(sampleToBeSorted, key= lambda x:[(i[1],i[0],i[2]) for i in x])
[(('A', 31, 'B'), ('D', 32, 'B')),
(('C', 31, 'A'), ('B', 24, 'C'), ('C', 33, 'B')),
(('D', 31, 'A'), ('D', 32, 'B'), ('C', 29, 'B'), ('D', 216, 'C')),
(('D', 31, 'A'), ('D', 52, 'B')),
(('D', 40, 'B'), ('A', 32, 'C')),
(('D', 52, 'B'), ('D', 32, 'B'))]

How to multisort elements in a List
By : Ben Smith
Date : March 29 2020, 07:55 AM
hope this fix your issue How can I sort a list of 3 variables? , Try like this:

