If a list meet a certain condition it will
create another list according to that. Try this,
retainEven :: [Int]->[Int]
if (mod n 2 == 0)
then n:(retainEven ns)
else retainEven ns
If you run this program like
You will get the output as;
If then else statment with strings
msg :: Int -> String
msg n =
if n< 10
then "Less than 10"
else "Equal or greater than 10"
Let and where
addStr :: Float -> String -> Float
addStr xstr = x + read str
sumStr :: [String] -> Float
SumStr = foldl addstr 0.0
But You can write this by using let keyword easilly.
let addStr x str = x + read str
in foldl addStr 0.0
or else you can write it by using where keyword like this.
aumStr = foldl addStr 0.0
where addStr x str = x + read str