? JavaScript Classes

What is a Class?

• Introduced in ES6, a class is a blueprint for creating objects with properties and methods.

• Syntactic sugar over JavaScript's prototype-based inheritance.

• Makes OOP (Object-Oriented Programming) style easier and cleaner.

Basic Class Syntax

class Person {  constructor(name, age) {    this.name = name;    this.age = age;  }  greet() {    console.log(`Hello, my name is ${this.name}, and I'm ${this.age} years old.`);  }}const person1 = new Person("Alice", 30);person1.greet();  // Hello, my name is Alice, and I'm 30 years old.

Key Concepts

• constructor: Special method called when creating an instance.

• methods: Functions inside classes.

• this: Refers to the instance object.

Inheritance

class Employee extends Person {  constructor(name, age, position) {    super(name, age);  // Call parent constructor    this.position = position;  }  work() {    console.log(`${this.name} is working as a ${this.position}.`);  }}const emp = new Employee("Bob", 28, "Developer");emp.greet(); // From Personemp.work();

Static Methods

• Belong to the class, not instances.

• Called directly on the class.

class MathUtil {  static square(x) {    return x * x;  }}console.log(MathUtil.square(5)); // 25

Summary

• Classes encapsulate data and behavior.

• Support inheritance for code reuse.

• Static members belong to the class itself.

Want examples on private fields, getters/setters, or how classes work under the hood?