egrueter-dev

function Person() {
  this.firstname = 'John'
  this.lastname = 'Doe'
}

var john = new Person(); 
var Sally = new Person(); 

console.log(john);
console.log(sally);

egrueter-dev

function Person() {
  console.log(this);
}

var john = new Person();

//=> Person {}

egrueter-dev

function Person() {
  this.firstname = ‘John’
  this.lastname = ‘Doe’
  console.log(`This function is invoked!`)
}

var john = new Person(); 
//=> "This function is invoked!"

egrueter-dev

console.log(john);

// => Person {Firstname: “John”, Lastname: “Doe” }

egrueter-dev

var john = new Person();

function Person() {
  this.firstname = ‘John’
  this.lastname = ‘Doe’
}

egrueter-dev

class InformalPerson extends Person {
  
  constructor(firstname, lastname) {
    super(firstname, lastname);
  }
    greet () {
     return 'Yo ' + firstname; 
    }
}

egrueter-dev

class Person {
  constructor(firstname, lastname) {
    this.firstname = firstname;
    this.lastname = lastname;
  }
  greet () {
    return 'hi ' + firstname;
  }
}

egrueter-dev

function greet() {
  console.log('hi')
}

greet.language = 'english'

console.log(greet.language)

// => 'english'

egrueter-dev

function greet() {
  console.log('hi')
}

egrueter-dev

var a = ["yo", "whadup", "?"];
// Arrays inherit from Array.prototype 
// (which has methods like indexOf, forEach, etc.)
// The prototype chain looks like:
// a ---> Array.prototype ---> Object.prototype ---> null