[Haskell-cafe] A small puzzle: inTwain as function of foldr

[Sittampalam, Ganesh]

Martijn van Steenbergen wrote:

> Consider the function inTwain that splits a list of even length
> evenly into two sublists: 
> 
>  > inTwain "Hello world!"
> ("Hello ","world!")
> 
> Is it possible to implement inTwain such that the recursion is done
> by one of the standard list folds? 

Does this help? http://www.brics.dk/RS/02/12/BRICS-RS-02-12.pdf

Ganesh

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