egrueter-dev

function a( ) {
  var myvar = 2
  function b() {
   console.log(myvar);
  }
  b( );
}

var myvar = 1;

egrueter-dev

// Let's assume we have object o, with its own properties a and b:
// {a: 1, b: 2}
// o.[[Prototype]] has properties b and c:
// {b: 3, c: 4}
// Finally, o.[[Prototype]].[[Prototype]] is null.
// This is the end of the prototype chain as null,
// by definition, null has no [[Prototype]].
// Thus, the full prototype chain looks like:
// {a:1, b:2} ---> {b:3, c:4} ---> null

egrueter-dev

var o = {
  a: 2,
  m: function(b){
    return this.a + 1;
  }
};

egrueter-dev

var o = {
  a: 2,
  m: function(b){
    return this.a + 1;
  }
};

console.log(o.m()); // 3
// When calling o.m in this case, 'this' refers to o

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

egrueter-dev

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

egrueter-dev

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

greet.language = 'english'

console.log(greet.language)

// => 'english'

egrueter-dev

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

egrueter-dev

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

egrueter-dev

var john = new Person();

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