Thanks for the quick reply! No, that wouldn’t work as that would tie a tuple to Int, Double,String for all tuples. (1,1,2,3,”string”, 4.5, “string”, 1) is also valid tuple In Java I would use List<Object> so any number of (non-primitives) can be used. Thanks Mike

On 5 Feb 2016, at 21:43, Imants Cekusins wrote:

...

T = (1, ”A string”, 3.4) i.e. an int, string and double.

would this suit:

data Object = Int' Int | Double' Double | String' String type T = [Object]

? _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners

Nice, thanks.

On 5 Feb 2016, at 22:03, Tony Morris wrote:

HList.

Also in Java, you'd use HList (never use Object). http://www.functionaljava.org/javadoc/4.0/fj/data/hlist/HList.html http://www.functionaljava.org/javadoc/4.0/fj/data/hlist/HList.html

On Sat, Feb 6, 2016 at 7:58 AM, Mike Houghton mailto:mike_k_houghton@yahoo.co.uk> wrote: Thanks for the quick reply!

No, that wouldn’t work as that would tie a tuple to Int, Double,String for all tuples.

(1,1,2,3,”string”, 4.5, “string”, 1) is also valid tuple

In Java I would use List<Object> so any number of (non-primitives) can be used.

Thanks

Mike

...

On 5 Feb 2016, at 21:43, Imants Cekusins mailto:imantc@gmail.com> wrote:

...

T = (1, ”A string”, 3.4) i.e. an int, string and double.

would this suit:

data Object = Int' Int | Double' Double | String' String type T = [Object]

? _______________________________________________ Beginners mailing list Beginners@haskell.org mailto:Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners

_______________________________________________ Beginners mailing list Beginners@haskell.org mailto:Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners

_______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners

In Java List<T> ensures all entries are of type T - so only one type allowed. List<Object> allows anything but you lose type safety. HList allows anything and retains the types. (but you do get a lot of <<< >>>>>> in declarations :) and really its pushing Java into something it isn’t. )

On 5 Feb 2016, at 22:13, Imants Cekusins wrote:

...

in Java, you'd use HList (never use Object).

this is new to me. How is it different from List? _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners