egrueter-dev

console.log(john);

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

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

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

var john = new Person();

//=> Person {}

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(firstname, lastname) {
  this.firstname = firstname
  this.lastname = lastname
}

var john = new Person(‘john’, ‘doe’);
var sally = new Person(‘sally’, ‘white’);

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

egrueter-dev

var width = 100;
console.log (width); //=> 100

egrueter-dev

var width = 100;
console.log (width); //=> 100
var width = 200
console.log (width); //=> 200

egrueter-dev

function setWidth() {
  var width = 100;
  console.log(width);
}

/// width not available here

egrueter-dev

if(age > 12) {
  const dogYears = age * 7
  console.log(‘You are ${dogYears} dog years old!’)
}

//=> dogYears not available here

egrueter-dev

if(age > 12) {
  let dogYears = age * 7
  console.log(‘You are ${dogYears} dog years old!’)
}

//=> dogYears not available here