Question

Hey all, I am trying to test if the argument passed into my function is a class name so that I may compare it to other classes using instanceof.

For example:

function foo(class1, class2) {   // Test to see if the parameter is a class.   if(class1 is a class)   {     //do some kind of class comparison.     if(class2 is a class)     {        if(class1 instanceof class2)        {           //...        }     }     else     {        //...     }   }   else     //... } 

Is this possible? I am having trouble googleing an answer.

Answer 1

There is really no such thing as a ‘class’ in javascript — everything but primitives are an object. Even functions are objects.

instanceof DOES work with functions though. Check out this link.

function Car(make, model, year) {   this.make = make;   this.model = model;   this.year = year; } var mycar = new Car('Honda', 'Accord', 1998); var a = mycar instanceof Car;    // returns true var b = mycar instanceof Object; // returns true