How to get variable name javascript?

var testint=1;

var teststr=“val”;

var val1=5;//print value

var val2=8;

var val3=4;

Debug.Log(this[teststr+testint.ToString()]);//I want to variable name value.

http://abdullin.com/journal/2008/12/13/how-to-find-out-variable-or-parameter-name-in-c.html/