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JavaScript | class expression

  • Last Updated : 02 Jun, 2020

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



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