Combination Inheritance

Combination inheritance (also called pseudo‑classical inheritance) combines prototype chain inheritance and constructor stealing. It allows inheriting both instance properties (with their own copies) and shared methods via the prototype.

Code Example

function Parent(name) {
  this.name = name;
  this.colors = ["red", "blue"];
}
Parent.prototype.greet = function () {
  console.log(`Hello ${this.name}`);
};

function Child(name, age) {
  Parent.call(this, name); // inherit instance properties
  this.age = age;
}
Child.prototype = new Parent(); // inherit methods
Child.prototype.constructor = Child; // fix constructor reference

const child1 = new Child("John", 10);
child1.colors.push("green");
console.log(child1.colors); // ["red", "blue", "green"]
child1.greet(); // "Hello John"

const child2 = new Child("Jane", 12);
console.log(child2.colors); // ["red", "blue"]