Ah yes - the joy of Haskell It so easy to roll your own, rather than search to find someone else's (better/more elegant) solution... :-)
On 2 Aug 2012, at 11:41, Erik Hesselink wrote: > On Thu, Aug 2, 2012 at 12:30 PM, Andrew Butterfield > <andrew.butterfi...@scss.tcd.ie> wrote: >> >> On 2 Aug 2012, at 09:25, Erik Hesselink wrote: >> >>> Isn't this exactly the problem solved by all the lens packages? >>> Current popular ones are fclabels [0] and data-lens [1]. >>> >>> [0] http://hackage.haskell.org/package/fclabels >>> [1] http://hackage.haskell.org/package/data-lens >> >> Not sure what all of these do, but I have a simple solution I use >> in my work: > > They do exactly that. They create 'lenses' which are > getters/setters/modifiers combined, and allow you to compose these to > get/set/modify deep inside nested data types. Look at the examples in > the fclabels documentation [2] for more details. > > [2] > http://hackage.haskell.org/packages/archive/fclabels/1.1.4/doc/html/Data-Label.html -------------------------------------------------------------------- Andrew Butterfield Tel: +353-1-896-2517 Fax: +353-1-677-2204 Lero@TCD, Head of Foundations & Methods Research Group Director of Teaching and Learning - Undergraduate, School of Computer Science and Statistics, Room G.39, O'Reilly Institute, Trinity College, University of Dublin http://www.scss.tcd.ie/Andrew.Butterfield/ -------------------------------------------------------------------- _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
