Null value in Array

please Try rule!APN_isEmpty

@rohandhondilalk Maybe worth applying a length(ri!array)=0 as secondary level check?

In case you mean you want to find a null value in an array of other data, you can use a combination of where() and apply(), as in the following example code:

with(
array: {"a", "b", null(), "d"},

where(
apply(fn!isnull, array)
)
)

you can do like this if(OR(rule!APN_isEmpty(ri!array),length(ri!array)=0)).

You can check by using below code....
if(or(isnull(ri!array),length(ri!array)=0),true statements, false statements )

if you want just to have true or false for null value in array can't we use
any(fn!isnull,arrray)?

@sikhivahans, we had applied and it was working at run time. When we had implemented the same in the designer mode, it was not working as expected.

Hi ramanjaneyulut, Thanks !!. It worked . :)

@chandrasekharg, @rishub, @mschmitt, @sparshs, @sikhivahans : Thank you all for the response .

If you want to just check if the array variable is itself null or Empty, you can use:
or(local!myarray="", length(local!myarray)=0). This will work for any type of primitive array.

If your array has few elements which are null, you can also use the reject function.
Example: reject(fn!isnull, {1,3,2,null, 5}) . This will return {1,3,2,5}

isnull() does not work on arrays as expected as you observed - the reason is that sometimes an array maybe empty but not null, When an array is empty isnull() will return false. And it is common in SAIL UI to set array variables to null or empty list.
Either may happen, but in both the cases the isnull() behaves differently. It will be false for empty list, but true when it is actually null.
So, its better to avoid using isnull to check for nullability of array variables.