Question

var foo = "bar"
var bar  = "realvalue";

Is it possible to print the value of bar using foo ?

Answer 1

Approach 1: global variable

var foo = "bar";
var bar  = "realvalue";
alert(window[foo]);

OR

Approach 2: namespace
Divide your js to namespaces

var namespace = {
 foo : "bar",
 bar : "realvalue"
};
alert(namespace[namespace.foo]);