Variable name as a string in Javascript

Question

Is there a way to get a variable name as a string in Javascript? (like NSStringFromSelector in Cocoa)

I would like to do like this:

var myFirstName =         


        

Answer 1

You can use the following solution to solve your problem:

const myFirstName = 'John'
Object.keys({myFirstName})[0]

// returns "myFirstName"

Answer 2

This works for basic expressions

const nameof = exp => exp.toString().match(/[.](\w+)/)[1];

Example

nameof(() => options.displaySize);

Snippet:

var nameof = function (exp) { return exp.toString().match(/[.](\w+)/)[1]; };
var myFirstName = 'Chuck';
var varname = nameof(function () { return window.myFirstName; });
console.log(varname);

Answer 3

When having a function write a function that changes different global variables values it is not always myfirstname it is whatever happens to be passing through. Try this worked for me.

_{Run in jsfiddle}

var jack = 'jill';
function window_getVarName(what)
{
  for (var name in window)
  {
    if (window[name]==what)
    return(name);
  }
  return("");
}
document.write(window_getVarName(jack));

Will write to the window 'jack'.

Answer 4

best way using Object.keys();

example for getting multi variables names in global scope

// multi varibles for testing
var x = 5 , b = true , m = 6 , v = "str";

// pass all varibles you want in object
function getVarsNames(v = {}){
    // getting keys or names !
    let names = Object.keys(v);
    // return array has real names of varibles 
    return names;
}

//testing if that work or not 
let VarsNames = getVarsNames({x , b , m , v});

console.log(VarsNames); // output is array [x , b , m , v]

Answer 5

var x = 2;
for(o in window){ 
   if(window[o] === x){
      alert(o);
   }
}

However, I think you should do like "karim79"