RosettaCodeData/Task/Inverted-syntax/PowerShell/inverted-syntax-2.psh

function Action ([scriptblock]$Expression, [Alias("if")][bool]$Test)
{
    if ($Test) {&$Expression}
}

Set-Alias -Name say -Value Action

say {"Thank God it's Friday!"} -if (Get-Date 5/27/2016).DayOfWeek -eq "Friday"