JavaScript, how to get the class name of an object
If you have an object that's generated from a class, and you want to get its class name. How can you do so?
Suppose you have an object that’s generated from a class, and you want to get its class name.
For example, let’s use this code as reference:
class Dog {
}
const roger = new Dog()Of course now we know that roger is an object that’s created from the class Dog.
But how do you get the class name of the object, in case you don’t know it?
You can lookup the object’s constructor, then reference its name property.
In this example:
class Dog {
}
const roger = new Dog()
console.log(roger.constructor.name) // 'Dog'
This method returns a string that represents the class name.
You can also directly compare the constructor property to the class, like this:
class Dog {
}
const roger = new Dog()
roger.constructor === Dog //true
download all my books for free
- javascript handbook
- typescript handbook
- css handbook
- node.js handbook
- astro handbook
- html handbook
- next.js pages router handbook
- alpine.js handbook
- htmx handbook
- react handbook
- sql handbook
- git cheat sheet
- laravel handbook
- express handbook
- swift handbook
- go handbook
- php handbook
- python handbook
- cli handbook
- c handbook
subscribe to my newsletter to get them
Terms: by subscribing to the newsletter you agree the following terms and conditions and privacy policy. The aim of the newsletter is to keep you up to date about new tutorials, new book releases or courses organized by Flavio. If you wish to unsubscribe from the newsletter, you can click the unsubscribe link that's present at the bottom of each email, anytime. I will not communicate/spread/publish or otherwise give away your address. Your email address is the only personal information collected, and it's only collected for the primary purpose of keeping you informed through the newsletter. It's stored in a secure server based in the EU. You can contact Flavio by emailing flavio@flaviocopes.com. These terms and conditions are governed by the laws in force in Italy and you unconditionally submit to the jurisdiction of the courts of Italy.