In JavaScript, classes are a way to define object blueprints or templates for creating objects. Classes were introduced in ECMAScript 6 (ES6) and provide a more structured and familiar syntax for creating object-oriented programming (OOP) constructs in JavaScript.
Here’s an example of a simple class definition:
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
sayHello() {
console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);
}
}
This class Person has a constructor that takes two arguments, name and age, and sets them as properties on the object instance using this. It also has a method sayHello() that logs a greeting message to the console, using the object’s name and age properties.
To create an instance of this class, you can use the new keyword and pass in the constructor arguments:
const john = new Person('John', 30);
john.sayHello(); // logs "Hello, my name is John and I'm 30 years old."
Classes provide several benefits:
Classes in JavaScript are not true classes in the traditional OOP sense, but rather syntactic sugar over JavaScript’s existing prototype-based inheritance system. However, they provide a more familiar and structured syntax for creating and working with objects in JavaScript.
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