Continue to next iteration on VBScript

Question

A colleague and I were trying to figure out a way of doing the equivalent of a  continue  statement within a VBScript  For Next  loop   Everywhere we looked we found people had no way to do this in VBScript without having nasty nestings  which is not an option for us since it is a quite big loop   We came out with this idea  Would it work just as a  continue to next iteration    Does anyone have any better workaround or improvement suggestion   For i 1 to N   For workaroundloop   1 to 1      Code      If Condition1 Then       Exit For     End If       MoreCode      If Condition2 Then       Exit For     End If       MoreCode      If Condition2 Then       Exit For     End If               Next Next   Thanks for your comments

User · Answer

Try use While Wend and Do While   Loop statements     i   1 While i  lt  N   1 Do While true      Code      If Condition1 Then        Exit Do     End If       MoreCode      If Condition2 Then        Exit Do     End If                 Exit Do Loop Wend

User · Answer

A solution I decided on involved the use of a boolean variable to track if the for loop should process its instructions or skip to the next iteration   Dim continue  For Each item In collection     continue   True      If condition1 Then continue   False End If      If continue Then          Do work     End If Next   I found the nested loop solutions to be somewhat confusing readability wise  This method also has its own pitfalls since the loop doesn t immediately skip to the next iteration after encountering continue  It would be possible for a later condition to reverse the state of continue  It also has a secondary construct within the initial loop  and requires the declaration of an extra var   Oh  VBScript   sigh   Also  if you want to use the accepted answer  which isn t too bad readability wise  you could couple that with the use of   to merge the two loops into what appears to be one   Dim i  For i   0 To 10   Do     If i   4 Then Exit Do     WScript Echo i Loop While False   Next   I found it useful to eliminate the extra level of indentation

User · Answer

I think you are intended to contain ALL YOUR LOGIC under your if statement  Basically     PRINTS EVERYTHING EXCEPT 4 For i   0 To 10     you want to say     If i   4 CONTINUE but VBScript has no continue   If i  lt  gt  4 Then   just invert the logic     WSH Echo  i     End If Next   This can make the code a bit longer  but some people don t like break or continue anyway

User · Answer

Your suggestion would work  but using a Do loop might be a little more readable   This is actually an idiom in C - instead of using a goto  you can have a do     while  0  loop with a break statement if you want to bail out of the construct early   Dim i  For i   0 To 10     Do         If i   4 Then Exit Do         WScript Echo i     Loop While False Next   As crush suggests  it looks a little better if you remove the extra indentation level   Dim i  For i   0 To 10  Do     If i   4 Then Exit Do     WScript Echo i Loop While False  Next

User · Answer

I use to use the Do  Loop a lot but I have started using a Sub or a Function that I could exit out of instead  It just seemed cleaner to me  If any variables you need are not global you will need to pass them to the Sub also   For i 1 to N  DoWork i Next  Sub DoWork i       Code      If Condition1 Then       Exit Sub     End If       MoreCode      If Condition2 Then       Exit Sub     End If       MoreCode      If Condition2 Then       Exit Sub     End If            End Sub

User · Answer

Implement the iteration as a recursive function    Function Iterate  i   N     If i    N Then       Exit Function   End If    Code    If Condition1 Then      Call Iterate  i 1  N         Exit Function   End If     Code    If Condition2 Then      Call Iterate  i 1  N         Exit Function   End If   Call Iterate  i 1  N    End Function   Start with a call to Iterate  1  N

User · Answer

We can use a separate function for performing a continue statement work  suppose you have following problem   for i 1 to 10  if condition  then    for loop body  contionue End If  Next   Here we will use a function call for for loop body   for i 1 to 10 Call loopbody   next  function loopbody    if condition  then    for loop body  Exit Function End If  End Function   loop will continue for function exit statement

User · Answer

One option would be to put all the code in the loop inside a Sub and then just return from that Sub when you want to  continue    Not perfect  but I think it would be less confusing that the extra loop

[vbscript] "Continue" (to next iteration) on VBScript

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