Powershell Loops

For Loops

For Loop (Using Counters)

For(InitValue; Comparison; Increment){ … }

$myFriends = @('Rob', 'Paul', 'Sam', 'Kyle')
For($counter=0; $counter -le ($myFriends.Length - 1); $counter++){
  Write-Host $myFriends[$counter] "is my friend."
}

Note: Would have been better to use -lt and actual length instead of the extra math, but showing what can be done here. Ex: `$counter -lt $myFriends.Length;`

Foreach (Using array elements)

Foreach($value in $array){ … }

$myFriends = @('Rob', 'Paul', 'Sam', 'Kyle') 
Foreach($friend in $myFriends){ 
  Write-Host $friend "is my friend." 
}

Do / While Loops

While($condition is true){ … }

$myFriends = @('Rob', 'Paul', 'Sam', 'Kyle')
$counter = 0
While($counter -lt $myFriends.Length){
  Write-Host $myFriends[$counter] "is my friend."
  $counter++
}

Do – While Loop

Will always run at least 1 time

$myFriends = @('Rob', 'Paul', 'Sam', 'Kyle')
$counter = 0
Do {
  Write-Host $myFriends[$counter] "is my friend."
  $counter++
} While($counter -lt $myFriends.Length)