exercises.js

////////////////////////////////////////////////
// Part 1: Working With Data Structures
////////////////////////////////////////////////

const album1 = {
  title: "Talking Heads",
  albumDetails: {
    released: new Date("September 16, 1977"),
    label:    "Sire",
    formats:  ["LP"]
  }
}  

// 1. Retrieve the string "Sire" from album1, and save it in a sensibly named
//    variable.

// ANSWER 1
const firstLabel = console.log(album1.albumDetails.label)

// 2. Change the title of album1 from "Talking Heads" to "Talking Heads: 77"

// ANSWER 2
album1.title = 'Talking Heads: 77'
console.log(album1.title)


const album2 = {
  title: "More Songs About Buildings and Food",
  albumDetails: {
    released: new Date("July 14, 1978"),
    label:    "Sire",
    formats:  ["LP", "8-track"]
  }
}  

const album3 = {
  title: "Fear of Music",
  albumDetails: {
    released: "August 3, 1979",
    label:    "Sire",
    formats:  ["Cassette"]
  }
}  

// 3. Access album2's formats array and use an array method to add "LP" to
//    album3's formats
// Check out the Array.push method!

// ANSWER 3
// why does this give me 2?
// solved during prework, was using unnecessary formatting
album3.albumDetails.formats.push(album2.albumDetails.formats[0])
console.log(album3.albumDetails.formats)


// 4. Change the release date of album3 from a string into a Date object
// Look ahead to album4 for a clue!

// ANSWER4
//why does date turn into a purple number?
album3.albumDetails.released = new Date("August 3, 1979")
console.log(album3.albumDetails.released)


const album4 = {
  title: "Remain in Light",
  albumDetails: {
    released: new Date("October 8, 1980"),
    formats: ["Cassette", "LP"]
  }
}  

// 5. Add the label "Sire" to album4's details

//ANSWER 5
album4.albumDetails.label = "Sire"
console.log(album4.albumDetails)

            
const album5 = {
  title: "Speaking in Tongues",
  albumDetails: {
    released: new Date("May 31, 1983"),
    label:    "Sire"
  }
}  



// 6. Add a 'formats' array to album 5 and add "CD", "Cassette", and "LP"

// ANSWER 7
album5.albumDetails.formats = ["CD", "Cassette", "LP"]
console.log(album5.albumDetails)


const album6 = {
  title: "Little Creatures",
  albumDetails: {
    released: new Date("June 10, 1985"),
    labels:   ["Sire", "emi"],
    formats:  ["CD", "cassette", "LP"]
  }
}  

// 7. Make the label "emi" in album6 all uppercase
// google how to make a string uppercase in js!


// ANSWER 8
album6.albumDetails.labels[1] = album6.albumDetails.labels[1].toUpperCase()
console.log(album6.albumDetails.labels[1])


const album7 = {
  title: "True Stories",
  albumDetails: {
    released: new Date("October 7, 1986"),
    labels:   "Sire, EMI",
    formats:  ["CD", "cassette", "LP"]
  }
}  

// 8. Convert album7's 'labels' property from the string value
//    "Sire, EMI" into the array: ["Sire", "EMI"]
// google js array split!

// ANSWER 9
album7.albumDetails.labels = album7.albumDetails.labels.split(', ')
console.log(album7.albumDetails.labels)


/////////////////////////////////////////////////////
// Part 2: More Tasks About Datatypes and Structures
/////////////////////////////////////////////////////

const album8 = {
  title: "Naked",
  albumDetails: {
    released: new Date("March 15, 1988"),
    labels:    ["Sire", "EMI"],
    formats:  ["CD", "cassette", "LP"]
  }
}  

const talkingHeadsAlbums = [
  album1, 
  album2,
  album3,
  album4,
  album5,
  album6,
  album7,
  album8,
]

// 1. Create an object literal called `band`.


const band = {
  }


// 2. Give it the property `name` and set it to "Talking Heads"


band.name = 'Talking Heads'


// 3. Give it the property `members` and set it to an array with a single
//    string, "David Byrne", in it.


band.members = ['David Byrne']


// 4. Give it the property `albums` and set it to the array stored in the
//    variable talkingHeadsAlbums


band.albums = talkingHeadsAlbums


// 5. Add "Tiny Weymouth", "Chris Franz" and "Jerry Harrison" to the members
//    array.


band.members.push('Tiny Weymouth', 'Chris Franz', 'Jerry Harrison')
console.log(band)


////////////////////////////////////////////////
// Part 3: Conditional Logic
////////////////////////////////////////////////

// 1. Write a conditional to console.log "Talking Heads were a prolific band"



if(talkingHeadsAlbums.length >= 6){
  console.log('The Talking Heads were a prolific band')
}else{
  console.log('The Talking Heads didn\'t have much input')
}


//    if the Talking Heads have 6 albums or more. Otherwise, console.log
//    "Talking heads didn't have much output." Use the array of albums
//talkingHeadsAlbums above.


if(talkingHeadsAlbums.length % 2 == 0) {
    console.log(talkingHeadsAlbums.length + ' is an even number')
  }else{
    console.log(talkingHeadsAlbums.length + 'is an odd number')
  }

// 2. Write a conditional to check if the number of albums in
//    talkingHeadsAlbums is odd or even, and then console.log
//    "The number X is odd" or "The number X is even" with X being
//    the number of albums.

// 3. Write conditionals to check if the number of albums in
//    talkingHeadsAlbums is divisible by either 2 or 3, and then
//    console.log one of:
//    - "The number Y is divisible by 2",
//    - "The number Y is divisible by 3",
//    - "The number Y is divisible by 2 and 3", or
//    - "The number Y is not divisible by 2 or 3",
//
//    with Y being the number of albums.



if(talkingHeadsAlbums.length % 2 === 0 && talkingHeadsAlbums % 3 === 0){
  console.log(talkingHeadsAlbums.length + ' is divisible by 2 AND 3')
}else if(talkingHeadsAlbums.length % 2 === 0) {
  console.log(talkingHeadsAlbums.length + ' is divisible by 2')
}else if(talkingHeadsAlbums.length % 3 === 0){
  console.log(talkingHeadsAlbums.length + ' is divisible by 3')
}else{
  console.log(talkingHeadsAlbums.length + ' is not divisible by 2 AND 3')
}


// 4. Check your logic above against the numbers: 0, 1, 2, 6, 7, and 9.
//    Make sure it always works!

/////////////////////////////////////////////////////
// Part 4: For Loops
/////////////////////////////////////////////////////

// 1. Use a for loop to print out the name of each Talking Heads album


// ANSWER 1
for(let i = 0; i < talkingHeadsAlbums.length; i++){
  console.log(talkingHeadsAlbums[i].title)
}
// 2. Create a variable called `sireTally`, and set it to the integer value 0.
//    Then use a for-loop to go through all the Talking Heads albums,
//    incrementing sireTally if the album was released under the "Sire" label.

//    Warning: some albums have a property `.label`, which is a string, and some
//    have `.labels`, which is an Array!


// ANSWER 2
// || is equal to 'or' in Python
let sireTally = 0
for(let i = 0; i < talkingHeadsAlbums.length; i++){
  if(talkingHeadsAlbums[i].albumDetails.label === "Sire" || talkingHeadsAlbums[i].albumDetails.labels.includes('Sire')){
    sireTally++
  }
}
console.log(sireTally)