Is there a more efficient way to detect if the player presses WASD?

Or would I have to go through and write

if (inputObject.KeyCode == Enum.KeyCode.W) then
	--Code
end

for each one?

You can print it out by implementing something like this :

if (inputObject.KeyCode == Enum.KeyCode.W) then
       print("Key pressed!")
end

That is the most efficient way to detect player keys. Maybe you need to change the code so that it can function better.

perhaps you're looking for something like

local keys = "WASD"
if string.find(keys, (tostring(inputObject.KeyCode)):sub(14)) then
	-- do stuff
end