var or local var

[muc 1]

Is there any difference in scenes or VDs between

  a= 3

  b= 2

  c= a+b

and

  local a= 3

  local b= 2

  local c= a+b

?

Thanks!

 

[petergebruers 1,268]

You need a bit more code to see a difference, you need a "block". See:

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Because a scene or a VD is a unit on its own, you won't notice a difference at the main level. But technically speaking, you should use "local". When you are using variables in a function or in a if-then-else-end the difference is important. It's explained after that link.

[muc 1]

Thanks Petergebruers,

 

I bought Ierusalimschy's book immediately, inside outside a function is now clear.

 

There is a new question: what do you mean with 'But technically speaking, you should use "local".' (at the main level) ?

Does the code run faster or does it need less ressources with 'local var' than without ?

 

Thank you!

[petergebruers 1,268]

On an HC2 it doesn't make a difference. I'm not fanatic about using "local" at the main level. It can make a difference on other platforms. If you want to experiment with Lua, you can try the excellent multi-platform "ZeroBrane Studio".

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