Class Basics in JavaScript

From the JavaScript cheat sheet · Classes · verified Jul 2026

Class Basics

Creating and using classes

javascript

// Class declaration
class Person {
  constructor(name) {
    this.name = name;
  }
  
  greet() {
    return `Hello, I'm ${this.name}`;
  }
}

const john = new Person('John');
john.greet();

💡 Classes are syntactic sugar over prototypes

⚡ Class methods are non-enumerable by default

📌 Class declarations are not hoisted

🔥 Always use new with classes, calling without throws error

More JavaScript tasks

Class Inheritance

Back to the full JavaScript cheat sheet