prototype.js

// Example of true prototypal inheritance style
// in JavaScript.

// object creation using the literal
// object notation {}.
const foo = { name: "foo", one: 1, two: 2 };

// Another object.
const bar = { two: "two", three: 3 };

// Object.setPrototypeOf() is a method introduced in ECMAScript 2015.
// For the sake of simplicity, let us pretend
// that the following line works regardless of the
// engine used:
Object.setPrototypeOf(bar, foo); // foo is now the prototype of bar.

// If we try to access foo's properties from bar
// from now on, we'll succeed.
console.log(bar.one); // Resolves to 1.

// The child object's properties are also accessible.
console.log(bar.three); // Resolves to 3.

// Own properties shadow prototype properties
console.log(bar.two); // Resolves to "two"
console.log(bar.name); // unaffected, resolves to "foo"
console.log(foo.name); // Resolves to "foo"