eamon0989

let obj = {};
console.log(Object.prototype); // [Object: null prototype] {}
console.log(Object.getPrototypeOf(obj)); // [Object: null prototype] {}

console.log(Object.prototype === Object.getPrototypeOf(obj)); // true
console.log(Object.prototype.isPrototypeOf(obj)); // true

Object.prototype.foo = 'Hey there!';
console.log(Object.prototype); // [Object: null prototype] { foo: 'Hey there!' }

eamon0989

let foo = {
  bar: 1,
};

console.log(foo.bar); // 1
console.log(foo.hasOwnProperty('bar')); // true

eamon0989

function Factory() {
  this.foo = 1;
  this.bar = 'string';
}

Factory.prototype.example = "I'm a property of Factory.prototype";
console.log(Factory.prototype); // { example: "I'm a property of Factory.prototype" }

let descendant = new Factory();
console.log(descendant); // Factory { foo: 1, bar: 'string' }

eamon0989

function Factory() {
  this.foo = 1;
  this.bar = 'string';
}

let descendant = new Factory();

console.log(descendant); // Factory { foo: 1, bar: 'string' }
console.log(Factory.prototype); // {}

eamon0989

// This is a continuation of the previous code block
Object.prototype.test = `I'm a property of Object.prototype`;

console.log(Object.prototype); // [Object: null prototype]
  // { test: "I'm a property of Object.prototype" } */

console.log(Factory.prototype.test); // I'm a property of Object.prototype
console.log(Factory.prototype); // {}
console.log(descendant.test); // I'm a property of Object.prototype

eamon0989

function Factory() {
  this.foo = 1;
  this.bar = 'string';
}

let descendant = new Factory();

console.log(Factory.prototype); // {}
console.log(Object.getPrototypeOf(Factory.prototype)); // [Object: null prototype] {}

eamon0989

function objectFactory() {
  return {
    property1: 'My first property',
    property2: 'My second property',

    printProperties() {
      for (let prop in this) {
        if (typeof this[prop] !== 'function') {
          console.log(`${prop}: ${this[prop]}`);
        }

eamon0989

function Grandfather(name, age, job) {
  this.name = name;
  this.age = age;
  this.job = job;
}

Grandfather.prototype.aboutMe = function() {
  console.log(`I'm ${this.name}, I'm ${this.age} years old and I'm ${this.job === 'retired' ? '' : 'a '}${this.job}.`);
};

eamon0989

class Grandfather {
  constructor(name, age, job) {
    this.name = name;
    this.age = age;
    this.job = job;
  }

  aboutMe() {
    console.log(`I'm ${this.name}, I'm ${this.age} years old and I'm ${this.job === 'retired' ? '' : 'a '}${this.job}.`);
  }

eamon0989

let name = 'Eamon';

function printName() {
  console.log(name);
}

printName(); // => 'Eamon'

name = 'Jack';
printName(); // => 'Jack'