# switch to starter branch to get new starter code
git checkout starter

# download new starter code
git pull

# switch back to main branch for coding
git checkout main

# merge in new starter code (use default msg)
git merge starter --no-edit

# code and enjoy!

/* My first program (in JavaScript) */
console.log("Hello world!"); //prints

<!DOCTYPE html>
<html>
<head>
  <!-- include here to load before page (or defer) -->
  <script src="js/my-script.js" defer></script>
</head>
<body>
   ... content ...


   <!-- include here to load "after" html -->
   <!-- put it here for this course -->
   <script src="js/my-script.js"></script>
</body>
<html>

<script src="path/to/my-script.js"></script>

/* index.js */
/* This is the ENTIRE contents of the file! */
console.log("Hello world!");  //executed first
console.log("I'm doing JavaScript!");  //executed second

let x = 'hello'; //value is a String

x = 42; //value is now a Number

//select the <h1> element
//returned value is an HTML Element (type)
const headingElement = document.querySelector('h1'); 

/* can use any valid CSS selector */
//selects the first element with `class="alert"`
const alertElement = document.querySelector('.alert');

console.log('40' + 2)
console.log('40' - 4)


const num = 10
const str = '10'

// What are the values of each expression?
// (they will all be booleans, true/false)
const bool1 = (num == str)
const bool2 = (num === str)
const bool3 = ('' == 0) //empty String compare to 0

//JavaScript
function greet(greeting, name){
    return greeting + ", " + name;
}


const msg = greet("Hello", "World");

//Java
public static String greet(String greeting, String name){
    return greeting  + ", " + name;
}

public static void main(String[] args){
    String msg = greet("Hello", "World");
}

//JavaScript
function greet(greeting, name){
    return greeting + ", " + name;
}


const msg = greet("Hello", "World");

# Python
def greet(greeting, name):
    return greeting  + ", " + name


msg = greet("Hello", "World")

const myArray = [1, 2, 3, 4];

//for loop to iterate through indices
for(let i=0; i<myArray.length; i++){
  const theItem = myArray[i]; //access element at index 
  console.log(theItem);
}

//loop array items
for(const theItem of myArray) {
  console.log(theItem)
}

//declare objects using literal syntax
const agesObj = {'sarah':42, 'amit':35, 'zhang':13}
const typeExamples = {'anInt':12, 'aStr':'dog', 'anArr':[1,2]}
const emptyObj = {}

////can omit quotes on keys, but they are actually strings!
const englishToSpanish = {one:'uno', two:'dos'}
const numWords = {1:'one', 2:'two', 3:'three'}

//global function to get the keys of an object (as an array)
const keysArray = Object.keys(numWords) //[ '1', '2', '3' ]

const agesObj = {alice:40, bob:35, charles:13};

//access ("look up") values
console.log( agesObj['alice'] ); //=> 40
console.log( agesObj['bob'] ); //=> 35
console.log( agesObj['charles'] ); //=> 13

//keys not in the object have undefined values
console.log( agesObj['fred']); //=> undefined

//assign values
agesObj['alice'] = 41;
console.log( agesObj['alice'] ); //=> 41

agesObj['fred'] = 19; //adds the key and assigns value

const person = {
  firstName: 'Alice',
  lastName: 'Wong',
  age: 40,
  favorites: {
    music: 'jazz',
    food: 'pizza',
    numbers: [12, 42]
  }
};

const name = person['firstName']; //get value of 'firstName' key
person['lastName'] = 'Jones'; //set value of 'lastName' key
console.log(person['firstName']+' '+person['lastName']); //"Alice Jones"

const chosenValue = "food" //e.g., from user input
const favFood = person['favorites'][chosenValue]; //object in the object
                //object           //value

const firstNumber = person['favorites']['numbers'][0]; //12
person['favorites']['numbers'].push(7); //push 7 onto the Array

const person = {
  firstName: 'Alice',
  lastName: 'Wong',
  age: 40,
  favorites: {
    music: 'jazz',
    food: 'pizza',
    numbers: [12, 42]
  }
};

const name = person.firstName; //get value of 'firstName' key
person.lastName = 'Jones'; //set value of 'lastName' key
console.log(person.firstName+' '+person.lastName); //"Alice Jones"

const chosenValue = "food" //e.g., from user input
const favFood = person.favorites.chosenValue; //undefined!!
              //object         //value

const firstNumber = person.favorites.numbers[0]; //12
person.favorites.numbers.push(7); //push 7 onto the Array

//Arbitrary list of people's names, heights, and weights
const people = [
    {name: 'Ada', height: 64, weight: 135},
    {name: 'Bob', height: 74, weight: 156},
    {name: 'Chris', height: 69, weight: 139},
    {name: 'Diya', height: 69, weight: 144},
    {name: 'Emma', height: 71, weight: 152}
]