// declare an empty array
let myThings = [];

// declare an array with items
let myThings = ['Bike', 7, {name: 'Jeff'}, ['Catfish']]

// declare an empty object
let car = {}

// declare an object with properties
let car = {
  make: 'Ford',
  model: 'GT',
  year: 2019
}

// adding or updating properties with dot notation
car.miles = 100;

// adding or updating properties with bracket notation
// if miles already exists on the object, this would change it's value
// if it doesn't this will set it as a key with a value of 150
car['miles'] = 150

// if a property doesn't exist on an object, it's considered undefined

car.owner === undefined // true

// Function Declaration

function doTheThing() {
  return 'Did the thing';
}

// Function Expression

let doTheThing = function() {
  return 'Did the thing';
}

// Function Parameters, Arguments and Invoking (calling) a Function
// name is a function parameter
// a variable we'll use in our function body

function sayMyName(name) {

// the string 'Your name is Jeff' will be output
// from this function because of the return keyword

  return 'Your name is ' + name;
}

// function invocation
// parentheses after the function tell the function to run
// The string Jeff is called an argument (a value passed to a function and received as a parameter)
sayMyName('Jeff');

// Here we're passing more arguments than there are parameters
// Only Jeff will be received as "name" in the parameter list
sayMyName('Jeff', 'Karen')