What is the difference between a constructor function and a class in JavaScript?

Can you explain the difference between a constructor function and a class in JavaScript?

Sure! In JavaScript, a constructor function is a regular function that is used to create objects. You define it using a function declaration and typically use the new keyword to create instances. A class, on the other hand, is a syntactical sugar over constructor functions introduced in ES6, providing a clearer and more concise way to create objects and handle inheritance.

What are the main advantages of using classes over constructor functions?

Classes offer a more intuitive syntax, support for inheritance through the extends keyword, and a clearer structure for defining methods. This can make your code easier to read and maintain.

Can you give me an example of both?

Absolutely! Here's a simple example:

Constructor Function:

function Person(name) {
    this.name = name;
}

Class:

class Person {
    constructor(name) {
        this.name = name;
    }
}

Are there any performance differences between the two?

Generally, there are no significant performance differences between constructor functions and classes. Both are ultimately converted to the same underlying prototype-based structure in JavaScript. However, classes may provide better optimization opportunities for JavaScript engines.