PowerShell -- Looking for equivalent of Perl's redo - powershell

Question

I have the following PowerShell loop:
Set-Variable -Name YELLOW -Option ReadOnly -Value 0
Set-Variable -Name ORANGE -Option ReadOnly -Value 1
Set-Variable -Name RED -Option ReadOnly -Value 2
While ($true) {
for ($color = $YELLOW; $color -le $RED; $color++) {
$LastWriteTime = ((Get-Item $FilePath).LastWriteTime)
$waitTime = (Get-Date).AddMinutes(-($WarningTimeArray[$color]))
$SleepTime = ($LastWriteTime - $waitTime).TotalSeconds
If ($SleepTime -gt 0) {
$WarningFlagArray[$color] = $false;
SendMail ("Start-Sleep -Seconds" + $SleepTime)
Start-Sleep -Seconds $SleepTime
Continue #Actually want a "redo"
}
ElseIf (-not $WarningFlagArray[$color]) {
SendMail $WarningMessageArray[$color]
$WarningFlagArray[$color] = $true
}
}
}
When PowerShell hits the "Continue", it continues back to the top of the for loop, and goes to the next color.
In Perl, you have last (equivalent to PowerShell's break) and you have next (equivalent to PowerShell's continue). You also have the redo which goes back to the top of the loop, but doesn't increment the for loop counter.
Is there an equivalent Powershell command to Perl's redo function for the for loop?
I can easily convert the statement into a while loop to get around this particular issue, but I was wondering if there is something like redo anyway.

Answer 1

I'm pretty sure PowerShell doesn't support what you're looking for. You can have labelled break and continue statements but neither will take you to the top of the inside of the associated loop/switch construct. If PowerShell had a goto statment you'd be set but I'm glad it doesn't have that keyword. :-) For more info on labelled break/continue see the about_break help topic.

Answer 2

An equivalent of Perl's redo would be nice, and I hope they introduce it in a future version, but mainly because it would be useful in Foreach-Object, foreach, and while loops.
However, in a for loop, at least a typical one, you can easily reproduce the functionality by simply reversing the incrementation immediately before the continue statement.
In this case, since the increment statement (aka <repeat> in the PowerShell documentation) is $color++, just stick $color-- immediately before continue. For clarity/elegance, I'd suggest putting them on one line to make it clearer that it's essentially a single loop control contsruct:
$color--; continue
The only reasons I can think of why that would ever not work:
You're otherwise manipulating the loop variable inside the loop. But I think that's terrible programming style and anyone who's doing that deserves to have their script break. ;)
You have a condition that depends on some other variable that can change within the loop, e.g. for ($i = 0; $i -lt $j; $i++) where $j can change within the loop.