2010/7/13 Ivan Lazar Miljenovic <[email protected]>: > vadali <[email protected]> writes: > >> hello, >> iam really new to haskell, >> >> i want to define a function which takes as a parameter a list which can >> contain other lists, eg. [1,[2,3],[4,[5,6]]] >> >> how would i define a function that can iterate through the items so (in this >> example) >> iter1 = 1 >> iter2 = [2,3] >> iter3 = [4,[5,6]] >> >> ? >> >> ( can i do that without using the Tree data type? ) > > Well, that's what a tree is, so why not use a tree? > > Your only other option is to define your own tree-like structure: > > data MyTree a = Value a | SubTree [MyTree a]
Defining your own tree structure is better in this case as Data.Tree store elements in each node, not just in the leaves. Cheers, Thu _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
