CODEWITHSUNDEEP
haskellfunctional-programming
Gusti Arya
Gusti Arya

Reputation: 1301

Haskell String to List String split by whitespace

I am very new to Haskell, I have a problem, how to split given string into list of words.

example "Hello world from haskell" -> ["Hello","world","from","haskell"]

thanks for your help

Upvotes: 5

Views: 12285

Answers (2)

Stanley Fernandes
Stanley Fernandes

Reputation: 432

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"]

Reference: https://hackage.haskell.org/package/base-4.12.0.0/docs/Data-String.html#v:words

Upvotes: 7

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 476547

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"]

Upvotes: 18

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