CODEWITHSUNDEEP
stringluastring-concatenation
systemdebt
systemdebt

Reputation: 4941

String Concatenation in Lua using a string value in a variable

I have functions named 

MapMSH(Msg.MSH, b)
MapPID(Msg.PID, b)
MapPV1(Msg.PV1,b)

NOW, in another function from where I will be calling above three functions, I have a variable u looping through values MSH, PID and PV1 I know I need to use .. operator to concatenate strings.

what I really want is the value in u to be concatenated to Map, something like

"Map"..u(Msg.u, b)

so that my functions get called automatically as soon as the value in u matches. With the syntax above, it says unexpected symbol near "Map" Can someone please tell me the exact syntax for that?

Upvotes: 1

Views: 1380

Answers (1)

Tim
Tim

Reputation: 2161

Try this if your functions are in the global namespace.

funcList = {"MSH","PID","PV1"}

for _,u in pairs(funcList) do
    _G["Map"..u](Msg[u],"X")
end

Test

Msg = { MSH="MSH", PID="PID", PV1="PV1" }
function MapMSH(a, b)
    print( a..b )
end
function MapPID(a, b)
    print( a..b )
end
function MapPV1(a, b)
    print( a..b )
end

Output

MSHX
PIDX
PV1X

Your problem is very similar to this problem.

Upvotes: 2

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