Haskell String to List String split by whitespace

You can use Hoogle and search for example by signature. Since you want to convert a String to a list of Strings, the signature is thus String -> [String]. The first matches are lines :: String -> [String] and words :: String -> [String]. Based on the name of the function, words is the right match.

As the documentation on words says:

words :: String -> [String]

words breaks a string up into a list of words, which were delimited by white space.

>>> words "Lorem ipsum\ndolor"
["Lorem","ipsum","dolor"]

This thus seems to be the function you are looking for. If we run this in ghci, we get the expected output:

Prelude> words "Hello world from haskell"
["Hello","world","from","haskell"]