Re: Adding dup to Data.Tuple?

On 28/10/18 03:51, Dannyu NDos wrote:

If this is for convenience for arrows, isn't it better implemented as?:

dup :: Arrow a => a b (b,b) dup = id &&& id

Hi Performance aside, I'd say your suggestion is better than using a pure function. It's clearer about what it does, and it works for functions as well (since they are arrows). Ivan