How do I check and delete an empty list [] or sublist [a, b, c, []]? Thanks
Check and delete from where?
If you want to delete internal empty lists from a list, you could use this code ...
for n = length(inputList) to 1 by -1
if is empty list(select item n from list inputList) then
remove item n from list inputList
end for
Note the backwards traversal. It is necessary because the item numbers collapse as you remove items.
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sory Im try in app inventor 2. I appreciate it very much, thank you
You can simply set a List as empty (first is a Blocks List, second a ListView):
That doesn't need to be a button click event, you can pop the code anywhere you need to.
You can also make a ListView invisible:
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