IFTE odd behaviour

[David Hayden]

(10-11-2019 08:36 PM)Claudio L. Wrote:  I think when the list is empty, list processing should be disabled and the empty list should simply be considered an object, and judged either {} = true, or {} = false by (some) definition. Just define it, document it, and done. Definitely not return 0 in my opinion.

But is this consistent with other list processing? I don't have my Prime handy, but what is {} + 1? I suspect it's {}.

To my mind, it would make sense to define list processing such that:
DoSomething(list, other arguments) is the same as:

Code:

result = {}
for each item in list
    temp = DoSomething(item, arguments)
    result = concat(result, temp);

That's easy to remember, defensible, and probably easy to implement. It means that any list processing with an empty list gives an empty list as a result.