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
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