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    <p>You can't say <code>PrintVariable(MyVariable)</code>, because Lua gives you no way of determining which variable (if any; a constant could have been used) was used to pass an argument to your function. However, you <em>can</em> say <code>PrintVariable('MyVariable')</code> then used the debug API to look for a local variable in the caller's scope which has that name:</p> <pre><code>function PrintVariable(name) -- default to showing the global with that name, if any local value = _G[name] -- see if we can find a local in the caller's scope with that name for i=1,math.huge do local localname, localvalue = debug.getlocal(2,i,1) if not localname then break -- no more locals to check elseif localname == name then value = localvalue end end if value then print(string.format("%s = %s", name, tostring(value))) else print(string.format("No variable named '%s' found.", name)) end end </code></pre> <p>Now you can say:</p> <pre><code>PrintVariable('MyVariable') </code></pre> <p>While in this case will print "MyVariable = 4".</p> <hr> <p>Not, if you <em>really</em> want to do this without the quotes, you could check the caller's locals for variables that have a supplied value, but that's occasionally going to give you the wrong variable name if there is more than one variable in the caller's scope with a given value. With that said, here's how you'd do that:</p> <pre><code>function PrintVariable(value) local name -- see if we can find a local in the caller's scope with the given value for i=1,math.huge do local localname, localvalue = debug.getlocal(2,i,1) if not localname then break elseif localvalue == value then name = localname end end -- if we couldn't find a local, check globals if not name then for globalname, globalvalue in pairs(_G) do if globalvalue == value then name = globalname end end end if name then print(string.format("%s = %s", name, tostring(value))) else print(string.format("No variable found for the value '%s'.", tostring(value))) end end </code></pre> <p>Now you can say <code>PrintVariable(MyVariable)</code>, but if there happened to be another variable in the caller's scope with the value <code>4</code>, and it occurred before <code>MyVariable</code>, it's <em>that</em> variable name that will be printed.</p>
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