Variable name as string in JavaScript

Question

Is there a way to retrieve a variable's name in JavaScript without it being part of an object? Here's an example of what I'm trying to achieve:

var obj = {//Declared in a global scope
 init:function(){
 var var1 = /*value from input*/;
 var var2 = /*value from input*/;
 doCode({name:/*variable name as a string, "var1"*/,val:var1});
 doCode({name:/*variable name as a string, "var2"*/,val:var2});
 function checkNumber(args){
 if(typeof args.val != 'number')
 console.error("Error variable '"+arg.name+"' is not a number!");
 else
 console.log("Variable '"+arg.name+"' is a number!");
 }
 }
}
obj.init();

• Ry-: Except in very specific circumstances, like when the calling function only calls checkNumber once with one variable as its argument or the value is unique among some object you can access from the function, the answer is "no". Why do you want to do this?
• adeneo: In what scope is var1 and var2 declared ?
• sanchez: How about this[variableName] ?
• adeneo: @san.chez - depends on the scope, and what this really is, that's why I asked ?
• Ry-: @PhilippeTrépanier: Keep them all in one object, pass the name. Alternatively, pass the field and create a data-label attribute or something, then check arg.value and use arg.dataset.label. (Note that your typeof check probably doesn’t perform as intended if this is user input...)

Answer 1

This might work

var foo = 'bar'
var fooname
for (var i in window) {
 if (window[i] == foo) fooname = i
}
alert(fooname) // alerts 'foo'

upd Of course, that have some restrictions, for example you can't have two variables with same content, but it is the only way I still found.

• PhilTrep: I wont use this in a global scope but with an object instead, thank you! +1 and correct.