How Can I Get a JavaScript Variable's Name as a String?

Variable Name as a String in Javascript

In Javascript, there is a need to obtain a variable's name as a string. This is similar to the functionality provided by NSStringFromSelector in Cocoa.

To achieve this, one can utilize the following solution:

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

The above code will return "myFirstName" as the variable name in string format.

This is particularly useful in scenarios like connecting a browser and another program using JavaScript. For instance, in the following example, instance names are sent from a browser to another program for a callback method:

FooClass = function(){};
FooClass.someMethod = function(json) {
  // Do something
}

instanceA = new FooClass();
instanceB = new FooClass();
doSomethingInAnotherProcess(instanceB); // result will be substituted by using instanceB.someMethod();

...

From the other program:

evaluateJavascriptInBrowser("(instanceName).someMethod("resultA");");

By using this technique, it becomes possible to dynamically generate callback method calls based on the variable name.

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