egrueter-dev

erik.weight = 185
erik.weight //=> 185

egrueter-dev

const erik = { weight: '155lbs',  height: '6 4'};

egrueter-dev

const key = 'baby’s first constant';
key = 'changed!'; //=> Uncaught TypeError: Assignment to constant variable..........

egrueter-dev

} // Defining our block
let secret = ‘skedaddle’
let secret = ‘password’ 
//=> Uncaught SyntaxError: Identifier ‘secret’ has already been defined.
{

egrueter-dev

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

//=> dogYears 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

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

/// width not available here

egrueter-dev

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

egrueter-dev

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

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” }