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Cyri

Select case question

6 posts in this topic

#1 ·  Posted (edited)

I know this is going to be a stupid question but here goes. Why does the following code not work as expected? Both cases are evaluated to be true. I'm running the latest production code 3.3.4.0.

$test = "testing"

Select
    Case $test <> ""
        MsgBox(0, "", "$test is not equal to nothing")
        ContinueCase
    Case $test = ""
        MsgBox(0, "", "$test is equal to nothing")
EndSelect

I know the above example is better suited for a Switch statment, but I'm just using it as an example. The one in my actual script is more complex and validates different expressions in each case.

Edited by Cyri

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short answer is variable types..

try ensuring you are using the proper operands or generating the proper values to test strings or numbers. to test for empty strings, I often use StringLen($var), for example.


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short answer is variable types..

try ensuring you are using the proper operands or generating the proper values to test strings or numbers. to test for empty strings, I often use StringLen($var), for example.

:mellow:

ContinueCase continues case.


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eMyvnE

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No, the only problem is improper expectations of ContinueCase. When you do ContinueCase, the next case is unconditionally executed. Doesn't seem right to me, but that's how it works. I would have expected ContinueCase to go to the next Case test, not unconditionally execute it.

:mellow:


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No, the only problem is improper expectations of ContinueCase. When you do ContinueCase, the next case is unconditionally executed. Doesn't seem right to me, but that's how it works. I would have expected ContinueCase to go to the next Case test, not unconditionally execute it.

:mellow:

Thanks for the clarification on that. I would have also expected it to evaluate the next case expression. The documentation on ContinueCase doesn't really spell that out either.

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#6 ·  Posted (edited)

Your initial interpretation wouldn't make sense in a Switch where Cases shouldn't overlap.

That's why ContinueCase is harder to emulate with If...

Should ContinueCase have "jumped" to the test of the next Case, then it would merely be a syntactic sugar.

Select
 Case $x = 1
    ; do something
    ContinueCase
 Case $x = 2    ; <-- assume ContinueCase would get you here
    ; do something else
 ...

could have been simply written:

If $x = 1 Then
 ; do something
Endif
If $x = 2 Then
 ; do something else
...

But if you want to emulate the actual specific behavior of ContinueCase, you have to make it less simple and less readable:

Local $skip = 0
If $x = 1 Then
 ; do something
 $skip = 1
Endif
If $x = 2 Or $skip Then
 ; do something else
...
Edited by jchd

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