intersperse

リストの各要素間に値を入れてconcatする

「intersperse」は「散りばめる」という意味

intersperse :: a -> [a] -> [a]

例

code:hs

>> intersperse ',' "abcde"

"a,b,c,d,e"

code:hs

>> concatMap (++ ",") "abcde"

"a,b,c,d,e,"

code:hs

>> unlines "abcde"

"a\nb\nc\nd\ne\n"