inheritance based on prototype chain

prototype.js

/**
 *  The most common and buggy prototype chain inheritance.
 *  You won't use this in production, you swear
 *  Problems:
 *  1. The most famous shared referece bug
 */
function father(name, age) {
  this.name = name;
  this.age = age;
  this.family = ['tommy', 'buddy', 'kathy'];
}

father.prototype.sayHello = function() {
  console.log('I am Father');
};

function child() {}

let f = new father('daddy', 100);
child.prototype = f;