AllTrue / AllFalse return True for empty lists

[andydandy74]

Shouldn't AllTrue / AllFalse return false when passed an empty list? I think they should only return true if the list contains at least one item (and if all items in the list satisfy the condition, of course).

[jnealb]

@andydandy74 Thanks - this is tracked with MAGN-7932.

[ke-yu]

@andydandy74,, @jnealb , that's expected.

May I say that "all items are true" (AllTrue) is logically equivalent to "there is no item which is false" (Not (SomeFalse)). Now consider an empty list. Obviously, as no item in an empty list, SomeFalse should return false, so Not (SomeFalse) returns true, thenAllTrue returns true. Similarly for AllFalse.

So although at the first glance it is weird that both AllTrue and AllFalse return true for an empty list, but that's expected.

[andydandy74]

Thanks for clarifying that, @ke-yu - I guess I'll just have to make a custom AllTrue/AllFalse node that checks against List.IsEmpty beforehand.