RE: Translate String of Variable Name into Variable Value
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- Subject: RE: Translate String of Variable Name into Variable Value
- From: "Jerome Vuarand" <jerome.vuarand@...>
- Date: Fri, 1 Jun 2007 10:21:30 -0400
spam@bitlet.com wrote:
> I'm trying to expand some existing LUA code in a project. Below is a
> simplified version of an existing function to explain what I'm after:
>
> const foo = 4
>
> function compare_value(a,b)
> return a == b
> end
>
> [...]
>
> What I want to do is translate variable "a" from the string "foo"
> into its equivalent named variable value of "4", so that:
>
> compare_label("foo",4)
>
> is true.
I see two possibilities:
-- 1. Put constants in a table
local const = {
foo = 4
}
function compare_label(a,b)
return const[a]==b
end
-- 2. Use the global table to hold the constants
foo = 4
function compare_label(a,b)
return _G[a]==b
end
Note that the second example implies that foo is global. If foo is
local, you can't reliably access its name at runtime.