use the built in loop of the switch, no foreach required

LoopSwitchSample2.ps1

$nums = 1..15
Switch($nums)
{
    {$_ -lt 5} {write-host "$_ is less than 5!" -ForegroundColor Magenta}
    {$_ -lt 10} {write-host "$_ is less than 10!" -ForegroundColor green}
    {$_ -lt 15} {write-host "$_ is less than 15!" -ForegroundColor cyan}
    default {write-host "$_ is greater than or equal to 15" -ForegroundColor yellow}
}