Class Expressions and Hoisting

Lecture 206:- Class Expressions and Hoisting

Class expressions are similar to function expressions, in that they are not hoisted. When we declare a class using a class expression, the class is only available after the line of code that declares it.

Here's an example of a class expression:

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const MyClass = class {  constructor() {    // constructor code here  }  myMethod() {    // method code here  } };

In this example, MyClass is a class expression that is assigned to the constant variable MyClass. The class expression creates a new class with a constructor and a method.

Unlike function declarations, class expressions cannot be called before they are declared. For example, the following code would result in a ReferenceError:

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const myObj = new MyClass(); // ReferenceError: MyClass is not defined const MyClass = class {  constructor() {    // constructor code here  }  myMethod() {    // method code here  } };

This happens because the MyClass class expression is not available until after it is defined. If you want to use the class before it is declared, you can use a class declaration instead.