Skip to content
Related Articles

Related Articles

Improve Article

JavaScript | class expression

  • Last Updated : 08 Oct, 2021
Geek Week

JavaScript class is a type of function declared with class keyword, that is used to implement object-oriented paradigm. Constructors are used to initialize the attributes of a class. There are 2 ways to creating class in JavaScript.

  • class declaration
  • class expression

In this article, we’ll discuss class expression to declare classes in JavaScript and how to use them.

class expression:  The class expression is another way of creating classes in JavaScript and they can be named or unnamed. If named, the class name is used internally, but not outside of the class.

Syntax:

  • Using named class expression:
const variable_name = new Class_name {
    // class body
}
  • Using unnamed class expression:
const variable_name = class{
     //class body
}

Example 1: Named class expression:

Javascript




<script>
const Website = class Geek {
  constructor(name){
      this.name = name;
  }
  websiteName() {
    return this.name;
  }
};
 
const x = new Website("GeeksforGeeks");
console.log(x.websiteName());
</script>

Output:



GeeksforGeeks

Example 2: Unnamed class expression:

Javascript




<script>
const Website = class {
  constructor(name) {
    this.name = name;
  }
  returnName() {
    return this.name;
  }
};
 
console.log(new Website("GeeksforGeeks").returnName());
</script>

 
 

Output:

 

GeeksforGeeks

 

Supported Browser:

  • Chrome 42 and above
  • Edge 13 and above
  • Firefox 45 and above
  • Opera 29 and above
  • Safari 7 and above

Hey geek! The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. But before you tackle the big projects, we suggest you start by learning the basics. Kickstart your web development journey by learning JS concepts with our JavaScript Course. Now at it’s lowest price ever!




My Personal Notes arrow_drop_up
Recommended Articles
Page :