Is there any haskell function to concatenate list with separator?

Question

Is there a function to concatenate elements of a list with a separator? For example:

> foobar \" \" [\"is\",\"there\",\"such\",\"a\",\"function\",\"?\"]
[         


        

Answer 1

It's not hard to write one-liner using foldr

join sep xs = foldr (\a b-> a ++ if b=="" then b else sep ++ b) "" xs
join " " ["is","there","such","a","function","?"]