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https://github.com/drbragg/compound-data-drills-with-ruby

Some compound data drills for Launch Academy
https://github.com/drbragg/compound-data-drills-with-ruby

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Some compound data drills for Launch Academy

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README 

        
## Instructions



We've obtained some data from the Twitter API to learn more about some

Launchers! Now we want to use the data to answer some questions.



In this challenge, you'll write a program in `code.rb` that traverses through

the compound data structure we got back from our API call to print out some data

in a particular format and answer a series of questions.



The method `twitter_data` will return the data structure you need to use. You'll

learn even more about methods soon, but for now, know that calling `twitter_data`

will give you the whole structure to work with (i.e.

`twitter_data.each do |something|`, etc).



### Getting Set Up



```

$ cd ~/challenges

$ et get twitter-data

$ cd twitter-data

```



## Meeting Expectations Requirements



Write code to produce the terminal output shown in each example block. (Put

another way, when you run `ruby code.rb`, your program should display all of

this data sequentially in your terminal as shown in the example output blocks.)



1. Each username followed by its description. If there is no description (i.e.,

    `nil` then print out "NA" instead):



    Example Output:



    ```no-highlight

    LaunchAcademy: A 10 week, intensive bootcamp teaching you how to code with a

    focus on Ruby on Rails

    dpickett: Co-Founder at @LaunchAcademy, Co-Organizer of @bostonrb

    .

    .

    .

    ```



2. Each username followed by total number of followers.



    Example Output:



    ```no-highlight

    LaunchAcademy: 3590

    dpickett: 1604

    .

    .

    .

    ```



3. Each username and the length of their latest tweet.



    Example Output:



    ```no-highlight

    LaunchAcademy's latest tweet was 140 characters long.

    dpickett's latest tweet was 81 characters long.

    .

    .

    .

    ```



4. Each username followed by the total character count used in that user's last

    twenty tweets.



    Example Output:



    ```no-highlight

    LaunchAcademy used 2430 characters in their last twenty tweets.

    dpickett used 2147 characters in their last twenty tweets.

    .

    .

    .

    ```



5. Write Ruby code to answer each of the following questions about our Twitter

    data.



    As in the previous examples, display the answer to these questions in the

    terminal.



    * Which user has the most followers?

    * Which user has the most friends?

    * Which user has the greatest number of tweets?

    * Which users have a `description` listed in `twitter_data`?

    * Which users have a `location` listed in `twitter_data`?



### Sample Usage



* What are the twitter usernames in `twitter_data`?



```ruby

twitter_data.each do |hash|

  puts hash.keys.first

end

```



### Sample Output



```no-highlight

LaunchAcademy

dpickett

STWatkins78

chrisccerami

spencercdixon

corinnebabbles

dot_the_speck

bostonrb

judngu

lizvdk

hchood

wand_chris

julissaJM

ashleytbasinger

alacritythief

```



### Tips



* Break down the compound data structure into its smallest parts. Isolate a data

  structure and ask yourself what composes it. Is it an array of hashes? An

  array of strings? An array of arrays?



* Reference the Ruby docs for

  [Arrays](http://www.ruby-doc.org/core-2.2.0/Array.html),

  [Hashes](http://www.ruby-doc.org/core-2.2.0/Hash.html) and

  [Strings](http://www.ruby-doc.org/core-2.2.0/String.html)

  to explore what methods Ruby has to offer.



* Use `.each`. Use it a lot.



### Hint



Let's take a look at how you might parse through some of the data structure by

looking at one of the hashes in `twitter_data`:



```ruby

hash =

{"LaunchAcademy"=>

   {"description"=>

     "A 10 week, intensive bootcamp teaching you how to code with a focus on Ruby on Rails",

    "last twenty tweets"=>

     ["RT @chrisccerami: While learning web development I created a map of all of the shows @Screamales have played and damn @DonGiovanniRecs http…",

      "6 ways to quantify your code and why you need to do it: http://t.co/1WKtpo41tP by @kevinrcasey http://t.co/lulzPLTY8c",

      "Do more of what you want at work. How to create productive partnerships: http://t.co/QpYpHhHEid by @benvoss",

      "RT @Pistachio: SO rad. bunch of local women learning to code with @gdiBoston at @HubSpot right now: http://t.co/jaIxK7suOj",

      "RT @STWatkins78: Huge breakthrough on my breakable toy today...can upload local file to soundcloud from my app...time for a beer! #LaunchAc…",

      "Just say yes to opportunities, especially if they scare you. http://t.co/LcF2ilwKDu great advice by @kerry_benjamin1",

      "How the internet is changing software and business, using Ruby as an example: http://t.co/EMYeLa0se7 by  @ukitazume http://t.co/wNymPXcvAr",

      "RT @chrisccerami: @JustusEapen @LaunchAcademy @MarsCuriosity https://t.co/W6IBpIuIr0",

      "Come build some interesting projects! @womenwhocode Hack Night tomorrow. RSVP: http://t.co/wPgaQfQjVp http://t.co/sI5lIn9bJ9",

      "RT @SpencerCDixon: One of the greatest parts of being a developer is the massive amount of control you have over a computer. Feels very emp…",

      "7 reasons to love Minitest for testing Ruby code: http://t.co/Qbq5Wtb3RC by @FluxusFrequency, a graduate from our friends @gschool",

      "Interested in becoming a game developer? Here's how: http://t.co/xDJDzzFxA8 via @skilledup http://t.co/ir4GphhU3m",

      "Web developer hiring trends, and what they mean for you: http://t.co/0Ajg7TdQFm by @walesmd http://t.co/coRokF42kA",

      "RT @chrisccerami: I recently built my first API in Rails which I hope makes photos from Mars courtesy of @MarsCuriosity more accessible to …",

      "Build things that last. Make sure your work lives beyond you. http://t.co/YMbuOwhY36 by @acolangelo",

      "Thanks to everyone who came to Ship It! Saturday! Check out the latest blog post for a recap: http://t.co/EYSeUc87qQ http://t.co/pAG5x0GzTa",

      "Write your code as if your best friend's inheriting it http://t.co/kbtLURrPcN by @MGraybosch http://t.co/JesBAjwIiB",

      "Coding can improve the way we run the world. Old, but inspiring TED talk by @pahlkadot: http://t.co/mu7QqTZK6L http://t.co/Qol943YcX3",

      "Practicing pitches and getting ready for Career Day, coming up on January 27th and 28th! http://t.co/fxCcFIIMTc",

      "RT @lizvdk: The cool kids use GEOjson so I did too. Here's how I build it with Ruby: https://t.co/sXFTW9nzWb"],

    "number of followers"=>3590,

    "number of friends"=>699,

    "latest tweet"=>

     "RT @chrisccerami: While learning web development I created a map of all of the shows @Screamales have played and damn @DonGiovanniRecs http…",

    "number of tweets"=>1433,

    "location"=>"Boston, MA"}}

```



How would I find the description of `LaunchAcademy` in `hash`? First, I want to

isolate `LaunchAcademy`:



```ruby

hash["LaunchAcademy"]

=> {"description"=>"A 10 week, intensive bootcamp teaching you how to code with a focus on Ruby on Rails",

 "last twenty tweets"=>

  ["RT @chrisccerami: While learning web development I created a map of all of the shows @Screamales have played and damn @DonGiovanniRecs http…",

   "6 ways to quantify your code and why you need to do it: http://t.co/1WKtpo41tP by @kevinrcasey http://t.co/lulzPLTY8c",

   "Do more of what you want at work. How to create productive partnerships: http://t.co/QpYpHhHEid by @benvoss",

   "RT @Pistachio: SO rad. bunch of local women learning to code with @gdiBoston at @HubSpot right now: http://t.co/jaIxK7suOj",

   "RT @STWatkins78: Huge breakthrough on my breakable toy today...can upload local file to soundcloud from my app...time for a beer! #LaunchAc…",

   "Just say yes to opportunities, especially if they scare you. http://t.co/LcF2ilwKDu great advice by @kerry_benjamin1",

   "How the internet is changing software and business, using Ruby as an example: http://t.co/EMYeLa0se7 by  @ukitazume http://t.co/wNymPXcvAr",

   "RT @chrisccerami: @JustusEapen @LaunchAcademy @MarsCuriosity https://t.co/W6IBpIuIr0",

   "Come build some interesting projects! @womenwhocode Hack Night tomorrow. RSVP: http://t.co/wPgaQfQjVp http://t.co/sI5lIn9bJ9",

   "RT @SpencerCDixon: One of the greatest parts of being a developer is the massive amount of control you have over a computer. Feels very emp…",

   "7 reasons to love Minitest for testing Ruby code: http://t.co/Qbq5Wtb3RC by @FluxusFrequency, a graduate from our friends @gschool",

   "Interested in becoming a game developer? Here's how: http://t.co/xDJDzzFxA8 via @skilledup http://t.co/ir4GphhU3m",

   "Web developer hiring trends, and what they mean for you: http://t.co/0Ajg7TdQFm by @walesmd http://t.co/coRokF42kA",

   "RT @chrisccerami: I recently built my first API in Rails which I hope makes photos from Mars courtesy of @MarsCuriosity more accessible to …",

   "Build things that last. Make sure your work lives beyond you. http://t.co/YMbuOwhY36 by @acolangelo",

   "Thanks to everyone who came to Ship It! Saturday! Check out the latest blog post for a recap: http://t.co/EYSeUc87qQ http://t.co/pAG5x0GzTa",

   "Write your code as if your best friend's inheriting it http://t.co/kbtLURrPcN by @MGraybosch http://t.co/JesBAjwIiB",

   "Coding can improve the way we run the world. Old, but inspiring TED talk by @pahlkadot: http://t.co/mu7QqTZK6L http://t.co/Qol943YcX3",

   "Practicing pitches and getting ready for Career Day, coming up on January 27th and 28th! http://t.co/fxCcFIIMTc",

   "RT @lizvdk: The cool kids use GEOjson so I did too. Here's how I build it with Ruby: https://t.co/sXFTW9nzWb"],

 "number of followers"=>3590,

 "number of friends"=>699,

 "latest tweet"=>"RT @chrisccerami: While learning web development I created a map of all of the shows @Screamales have played and damn @DonGiovanniRecs http…",

 "number of tweets"=>1433,

 "location"=>"Boston, MA"}

 ```



I can then isolate `description` further to get the description as follows:



```ruby

hash["LaunchAcademy"]["description"]

=> "A 10 week, intensive bootcamp teaching you how to code with a focus on Ruby on Rails"

```



If that's how I find the description, how do I find the number of followers of `LaunchAcademy`?



```ruby

hash["LaunchAcademy"]["number of followers"]

=> 3590

```



What about the number of tweets?



```ruby

hash["LaunchAcademy"]["number of tweets"]

=> 1433

```



See the pattern? Isolate what you need by isolating what's around it. Breaking

up problems is the golden standard of a good programmer! (Use the force!)