return (str++"4") should work On 22 April 2015 at 20:54, Shishir Srivastava wrote:

Hi,

Going through the '<-' description in 'learnouahaskell' it says -

*" If we have a Maybe String and we bind it with <- to a variable, that variable will be a String"*

so if you write

do str <- Just "3"

str should be of type 'String'. My question is how do I return "34" by concatenating it to "4" because the following line of code fails -

--- do str <- Just "3" return str++"4"::Maybe String ---

or for that matter how can I return/print just the value of str from this do block ?

Thanks, Shishir

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