Prototype based

Objects inherit properties and methods from a prototype object. This is different from traditional OOP where inheritance is done through class definition. Check OOP in JavaScript for detailed usage of this paradigm.

• You can create objects without any class definition using {}, similar to a dictionary in Python.
• There is no separate constructors involved
• There is no class keyword, constructors are essentially functions

Each object has a hidden link to a prototype object from which it inherits.

function Person(name, age) {
  this.name = name;
  this.age = age;
}
 
Person.prototype.greet = function() {
  console.log("Hello, my name is", this.name);
};
 
const person1 = new Person("Alice", 30);
const person2 = new Person("Bob", 25);
 
person1.greet(); // Output: Hello, my name is Alice
person2.greet(); // Output: Hello, my name is Bob
 
console.log(person1.hasOwnProperty('greet')); // false (inherited from prototype)
console.log(Person.prototype.hasOwnProperty('greet')); // true (defined on prototype)