Concatenation in a For Loop

[Pixol]

My add-on currently has a high cpu usage
(according to Addon Profiler add-on)
I have commented out the majority of the script and found out this is the cause for major CPU usage, ~2CPU/sec. It's not as high as pitbull using like 20 but it's high for a simple task.

      for i=1,8 do
        for j=1,5 do
          x="CompactRaidGroup"..i.."Member"..j
        end
      end

Is there another other option than writing conditionals like below 40 times?
if i==1 and j==1
then x=CompactRaidGroup1Member1

Or is concatenation supposed to be a fairly high CPU usage task?

[Pixol]

Nevermind.
http://lua-users.org/wiki/StringsTutorial

Turns out using:

string.format("CompactRaidGroup%dMember%d", i,j)

is more CPU efficient

[Starinnia]

You could save the concatenated strings in a table and retrieve them the next time you need the strings instead of always performing the concatenation.

[Pixol]

Originally Posted by Starinnia You could save the concatenated strings in a table and retrieve them the next time you need the strings instead of always performing the concatenation.

Hmm sounds like a good idea. I'll try that with the stringformat and see if it makes it even more efficient. It's down to about ~0.30 now from 2

Update: Table method seems to be more efficient than calling stringformat everytime. Thanks cpu ~ 0.25 now
Was a good review on 2dimensional arrays
http://www.lua.org/pil/11.2.html