javascript-pour-les-jedis-episode-3-snippet-07.js

function Force() {}
Force.prototype.useForce = function () {
 return 'I am the Force to be used.';
};

function Jedi() {}
Jedi.prototype = {
 useForce: Force.prototype.useForce
};

const luke = new Jedi();
console.log(luke.useForce()); //=> 'I am the Force to be used.'
console.log(luke instanceof Jedi); //=> true
console.log(luke instanceof Force); //=> false