how to convert string to variable name in javascript code example

Example: variable name to string javascript

//Get variable name as string
function getVariableName(v) {
    for (var key in window) {
        if (window[key] === v)
            return key;
    }
}

//testing
var someValue = "something not important right now";
console.log(getVariableName(someValue)); //>> prints "someValue"
//also works in functions
function print(a) {
  console.log(getVariableName(a)); //>> prints "someValue" because of line 16
  //you'd think it would print "a" but it doesnt
}
print(someValue);//>> look at line 14