Ruby Scripts

Introduction

In this project, we're going to write a bunch of small Ruby programs that do a variety of things. Our primary objective is to give you a chance to ask questions about the concepts you encountered in the Introduction to Ruby.

Hopefully the exercises will also give you some ideas about what to build for your project — we'll see open-source libraries, web scraping, and maybe even sending emails.

BUT — again, your main task is to ask questions about variables, methods, arguments, loops, blocks, arrays, hashes, etc.

Setup

Follow the usual setup steps:

Ensure that you've forked this repository.
Follow the Starting on a project with Cloud9 guide to set up your workspace.
I always recommend closing as many browsers tabs as possible from the last project you were working on — it's very easy to get confused with too many tabs going.
At a Terminal prompt, set up the project (install a bunch of powerful libraries on the workspace, whatever the project depends upon, etc):
```
bin/setup
```
Open a new Terminal prompt by clicking the green ⨁.
Usually, at this point we launch our Rails application server by clicking Run Project. You can go ahead and do so and navigate to the running application, but we're not going to be building web pages this time.

Instead, at a Terminal prompt after the $, run a tiny little command-line script that I've prepared:
```
$ rails hi
```
You should see something like
```
"Well, hello there, AppDev!"
```
The code to make this happen is in lib/tasks/hello.rake; read it and try to make out what's what.
There's a Getting Started video on Canvas that you should watch first.

Tasks to write

We're going to write some more command-line-only Ruby programs.

rails bye

Create a new file, lib/tasks/bye.rake, and then add code to it similar to the code in hello.rake such that:

rails bye

outputs

"See you next time, AppDev!"

rails todays_date

In todays_date.rake, write some code such that the command

rails todays_date

outputs

Wed, 11 Apr 2018

(but replace with the real current date)

rails tgif

In tgif.rake, write some code such that the command

rails tgif

outputs

"Yay, it's Friday!"

if today is Friday; if not, it should output

"Nope, not yet :/"

rails fortune

In fortune.rake, write some code such that the command

rails fortune

outputs a random fortune from the provided list, something like

"Bide your time, for success is near"

Each time rails fortune is run, a different fortune should be displayed.

rails quote

In quote.rake, write some code such that the command

outputs a random quotation from the provided list, something like

"A person who chases two rabbits catches neither. -- Confucius"

Each time rails quote is run, a random quotation should be displayed.

rails play_rock

In rps.rake, write some code such that the command

rails play_rock

outputs "We played rock!", select a random move for the computer, and output the outcome; something like

"We played rock."
"The computer chose rock."
"We tied!"

Each time rails play_rock is run, a different computer move and outcome should be displayed.

rails play_paper

In rps.rake, write some code such that the command

rails play_paper

In rps.rake, write some code such that the command

outputs "We played paper!", select a random move for the computer, and output the outcome; something like

"We played paper."
"The computer chose scissors."
"We lost!"

Each time rails play_paper is run, a different computer move and outcome should be displayed.

rails play_scissors

In rps.rake, write some code such that the command

rails play_scissors

outputs "We played scissors!", select a random move for the computer, and output the outcome; something like

"We played scissors."
"The computer chose paper."
"We won!"

Each time rails play_scissors is run, a different computer move and outcome should be displayed.

rails example_input_from_file

Examine file_input.rake. rails example_input_from_file is already complete, but read it and try to figure out what it is doing.

Locate lib/input_files/example_input.txt, modify the copy in it, and then run rails example_input_from_file again.

Create your own input file, put some content in it, and make rails your_own_input_from_file output the content.

rails word_count

In word_count.rake, write some code such that the command

rails word_count

reads the contents of lib/input_files/word_count_text.txt and, based on what's in it, output something like

"File input: The first draft is just you telling yourself the story.\n"
"Character count (with spaces): 55"
"Character count (without spaces): 46"
"Number of words: 10"
"Occurrences of 'story': 1"

Try modifying the copy in word_count_text.txt and see if your program still produces the correct values.

rails loan_payment

In loan_payment.rake, write some code such that the command

rails loan_payment

reads the contents of

lib/input_files/loan_payment_apr.txt
lib/input_files/loan_payment_years.txt
lib/input_files/loan_payment_principal.txt

and, based on what's in them, output something like

"APR: 5.0"
"Number of Years: 10"
"Principal: $50000.0"
"Monthly Payment: $530.33"

using the formula

Try modifying the copy in loan_payment_principal.txt and see if your program still produces the correct values.