Closure example

gistfile1.lua

function hailIfCargoMatches(lookingFor, specialHail)
    function closure(event, data)
        local cargoname,_,_ = unpack(data)
        if cargoname:find(lookingFor, 1, true) then
           sendChat(specialHail,"PRIVATE",currentTarget)
        end
    end
    return closure
end

registerEvent(hailIfCargoMatches('Emergency','Do you have an emergency?'),TARGET_SCANNED)
registerEvent(hailIfCargoMatches('Valuable Stones','Prepare to be boarded, I want those stones!'),TARGET_SCANNED)