DISCLAIMER: my idea of fun and your idea of fun may well differ!
Ho, Ho, Ho!
Here's some PowerShell frolics I recently had with a customer. How we laughed!
The task - take the contents of a log file and reverse it with a loop. Oh, the joy!
Here's what I came up with:
$log=get-content.\20130902134204_GPO_Import.log
$i=$log.count
for ($i; $i-ge0; $i--) {
Write-Output$log[$i]
}
Here's what my customer came up with
$log=get-content.\20130902134204_GPO_Import.log
$i=$log.count
do {
Write-Output$log[$I]
$i--
}
until ($i-eq-1)
Pretty standard stuff, don't you agree? We wanted to see who was fastest... cometh the hour, cometh Measure-Command!
Well, I won that one by 6 milliseconds!
Next, how to make the loop faster? My customer hit upon the idea of using the format operator (-f)... good thinking!
Measure-Command-Expression {
$i=$log.count -1
for ($i; $i-ge0; $i--) {
"{$i}"-f$log
}
}
Wow, that's four times as fast!
Now, forget all that looping nonsense and let's use a static method:
Measure-Command-Expression {
[array]::reverse($log)
$log
}
Scintillating!
Peace, brethren and sistren...