Variable Comparing

[LurchMan]

Hello all - 

I don't need any help with a script this time just help explaining a snippet:

Local $Array[3] = [0, 1, ""]

For $i = 0 To UBound ($Array) - 1

    If $Array[$i] <> "" Then
        ConsoleWrite ('Value of array: ' & $Array[$i] & ' $Array[' & $i & '] is not ""' & @CRLF)
    Else
        ConsoleWrite ('Value of array: ' & $Array[$i] & ' $Array[' & $i & '] is ""' & @CRLF)
    EndIf

Next

Output:

Value of array: 0 $Array[0] is ""

Value of array: 1 $Array[1] is not ""

Value of array:  $Array[2] is ""

 

 

 

 

I understand why 0 gets translated as not <> "" as all three (0, "", False) would be translated as false.   Now the question - Is there a more standardized way to deal with these situations?  

I have a section of a script that would fill in an array and do compares similar to the one above and it was checking to see if an element had data in it.  Some of the data would be 0 and comparing it to "" would always return as True as seen above.  I obviously got around this by comparing the element to -1 instead of "" as all the data in this case was numerical but is there a better way to achieve this?

I apologize if this isn't well written, my thoughts are all over the place on this one.  Thanks for any thoughts in advance.

Edited April 18, 2014 by LurchMan

[FireFox]

Hi,

You need to compare the vars type in this case with VarGetType, or if you already know the type e.g IsNumber.

Br, FireFox.

[LurchMan]

Ok, that makes a little more sense.  Thank you for your help!

[jchd]

One more possibility between "just declared" and set to either 0 or empty string: explicitely initialize your variable(s) to Null. Requires recent enough AutoIt.