$var_computer = @{
    "Notebooks" = "NB";
    "PCs" = "PC";
    }

$var_os = @{
    "Windows10" = "Windows 10*";
    "Windows8.1" = "Windows 8.1*";
    }

function create_groups ($var_computer, $var_os, $path){
    ForEach ($key in ($computer_mappings).Keys) {
            $new_group_name = "_DEFAULT_" + $key
            if ((Get-ADGroup -Filter {Name -eq $new_group_name} -SearchBase $path) -eq $null) {
                New-ADGroup -name $new_group_name -GroupScope Global -Path $path
            }