Editing WoW:UI best practices (section)

==== Lua only ====

Old
 frame:SetScript("OnEvent", function()
     if event == "SOME_EVENT_NAME" then
         this:Show()
     elseif event == "SOME_OTHER_EVENT" then
         DEFAULT_CHAT_FRAME:AddMessage(format("%s: %s", arg1, arg2))
     end
 end)

New
 frame:SetScript("OnEvent", function(frame, event, firstArg, secondArg)
     if event == "SOME_EVENT_NAME" then
         frame:Show()
     elseif event == "SOME_OTHER_EVENT" then
         DEFAULT_CHAT_FRAME:AddMessage(format("%s: %s", firstArg, secondArg))
     end
 end)
[[Category:Interface customization]]