Player on screen alarm ignoring friends

Plays an alarm when you see player that is not in whitelist

                
local whitelist = {
    "FriendName1", 
    "FriendName2", 
    "FriendName3"
}

local function isInWhitelist(playerName)
    for , name in ipairs(whitelist) do
        if playerName == name then
            return true
        end
    end
    return false
end

local function checkForPlayers()
    local players = getScreenPlayers()
    for , player in ipairs(players) do
        local playerName = getCreatureName(player)
        if playerName and not isInWhitelist(playerName) then
            playSound("playerOnScreen.wav")
            break
        end
    end
end

autoRun(1000, checkForPlayers)