On 9/19/11 1:48 PM, Tereza Snyder wrote:
You CAN compare arrays for equality (see the docs for "="), but evidently not
for INequality!
Right. You're not crazy. That's my experience too.
Phil
On Sep 19, 2011, at 3:42 PM, Andre Garzia wrote:
Tereza,
I don't think you can compare arrays like that... I never tried to do so, I
always sort the keys and iterate thru them.
andre
On Mon, Sep 19, 2011 at 5:30 PM, Tereza Snyder<ter...@califex.com> wrote:
I recently encountered a problem implementing an undo function in a script.
I needed to compare two arrays to see if any values had changed, like this:
put (tArray1<> tArray2) into sDirtyFlag
so that sDirtyFlag would be true when the arrays failed to match. However,
sDirtyFlag was always false! No matter what!
I put the two arrays into globals and compared them in the message box,
like this:
put (gArray1 = gArray2), and the result was always correct. I thought there
was some hidden horrible error in my script that dementia prevented me from
seeing, until I realized that in my script I was using "<>" not "=" to
compare.
See if the following script, pasted into a button, mystifies you the way it
did me. If you comment out the line:
put "xx" into tTestA2["low2"]
so that the arrays ARE equal you might see, as I did, that the comparison
is correct.
Evidently in LiveCode 4.5.3, buildnumber 1444, on MacOS 10.6.8,
"(tTestA1<> tTestA2)" is not the same as "not(tTestA1 = tTestA2)" when the
arrays are unequal.
(I apologize that the example is so elaborate, I was attempting to
reproduce the error environment.)
tereza
-- mind the linewraps
------------------------------
on mouseUp
DoArrayComparison
end mouseUp
on DoArrayComparison
-- create 1 array
repeat for each item iii in "low1,low2,low3"
repeat for each item ii in "lower1,lower2,lower3"
repeat for each item i in "lowest1,lowest2,lowest3"
put "data"&& iii&& ii&& i into tA1[iii][ii][i]
end repeat
end repeat
end repeat
-- create 2 arrays from it
put tA1 into tTestA1
put tTestA1 into tTestA2
-- make them unequal
put "xx" into tTestA2["low2"]
-- do three comparisons
put "(tTestA1 = tTestA2)="& (tTestA1 = tTestA2)&cr& \
"(tTestA1<> tTestA2)="& (tTestA1<> tTestA2)&cr& \
"not(tTestA1 = tTestA2)="& not(tTestA1 = tTestA2)
end DoArrayComparison
-------------------------------
--
Tereza Snyder
Califex Software, Inc.
<www.califexsoftware.com>
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http://www.andregarzia.com All We Do Is Code.
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PDS Labs
Professional Software Development
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