Powershell For Each Variable By Number - powershell

Question

I have the following variables:
$testvar_1 = 1, 100
$testvar_2 = 1, 20
$testvar_3 = 0, 260
$testvar_4 = 1, 10
How can I make a for loop that will loop through each variable array?
* When you dont know the total number of $testvar_n variables and it changes constantly. *
Something like For Each $testvar_n do { $testvar_n[1] = $testvar_n[1] + 10 }
Sorry very new to powershell.
EDIT:
Perhaps something that can work like the below?
get-variable testvar* | ForEach-Object -Process {$_[1]+10}

Answer 1

You can do something like the following if you need to actually update the existing variables.
foreach ($var in (Get-Variable -Name testvar_[0-9]* -ValueOnly)) {
$var[1] += 10
}
Note: [0-9] is the wildcard range operator for any single digit. The wildcard character * matches zero or more characters, which could match testvar_1abc for example. You can further prevent that with a Where-Object condition if necessary. See below for further filtering.
$vars = Get-Variable -Name testvar_[0-9]* | Where Name -match '^testvar_\d+$'
foreach ($var in $vars) {
$var.Value[1] += 10
}