When I want to determine whether or not an array element contains
non-whitespace, I usually say:
if word 1 of tDataA["item"] is empty then ... (or is NOT empty)
Just another option.
Phil Davis
On 3/8/21 5:36 PM, Bob Sneidar via use-livecode wrote:
Are you testing for empty, or are you testing if there is a value in an array
variable? If there is no key matching your array variable, LC will return an
empty string. An empty string is a value.
Mark is using a different method, seeing if a key of an array is itself an array. If bobtest ["value"] contains another
array so that bobtest ["value"] ["anumber"] contains 1, then bobtest ["value"] is an array. If
bobtest ["value"] contains 1 then it is not an array.
But getting the value of bobtest ["value"] ["number"] will return empty whether or
not bobtest '{value"] is an array. This is why Mark is testing for an array rather than the value.
It seems a bit wonky, you might think, "Why not return an error?" But trust me,
when you work with arrays, especially when it comes to datagrid data, this is the best
course.
Bob S
On Mar 8, 2021, at 16:25 , HENRY LOWE via use-livecode
<use-livecode@lists.runrev.com> wrote:
Thanks Mark. There are two possible states:
tArray[“status”] holds a value and tArray[“status”][“text”] does not
or
tArray[“status”][“text”] holds a value and tArray[“status”] does not
My code is trying to do the following:
If tArray[“status”] does not hold a value then check if
tArray[“status”][“text”] holds a value
The crux is how one reliably determines that an array member (e.g.
tArray[“status”]) holds a value?
I would have assumed that if the array member does not hold a value then - if
tArray[member] is empty would always return true. However that does not appear
to be the case if the array is multidimensional.
It appears that both tArray[“status”] is an array and tArray[“status”][“text”]
is an array are true. Am I missing something about using this syntax?
Thanks,
Henry
On Mar 8, 2021, at 3:56 PM, Mark Wieder via use-livecode
<use-livecode@lists.runrev.com> wrote:
On 3/8/21 3:46 PM, HENRY LOWE via use-livecode wrote:
I have often used the form 'if tArray[“key1”] is empty' to determine whether an
array element hold a value but this breaks if tArray[“key1”][“key2”] holds a
value.
Same here. Not that I've every liked that paradigm, just that it's been that
way since life crawled out of the ocean.
However this should do the trick.
if tArray["status"] is an array then
put tArray["status"]["text"] into tStatus
else
put tArray["status"] into tStatus
end if
--
Mark Wieder
ahsoftw...@gmail.com
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