ðŸŽ‰ Exercism Research is now launched. Help Exercism, help science and have some fun at research.exercism.io ðŸŽ‰

# rodrigopk's solution

## to Bob in the Crystal Track

Published at Jul 27 2020 · 0 comments
Instructions
Test suite
Solution

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

Bob answers 'Sure.' if you ask him a question.

He answers 'Whoa, chill out!' if you yell at him.

He answers 'Calm down, I know what I'm doing!' if you yell a question at him.

He says 'Fine. Be that way!' if you address him without actually saying anything.

He answers 'Whatever.' to anything else.

Bob's conversational partner is a purist when it comes to written communication and always follows normal rules regarding sentence punctuation in English.

## Setup

Follow the setup instructions for Crystal here:

http://exercism.io/languages/crystal

More help installing can be found here:

http://crystal-lang.org/docs/installation/index.html

## Making the Test Suite Pass

Execute the tests with:

``````\$ crystal spec
``````

In each test suite all but the first test have been skipped.

Once you get a test passing, you can unskip the next one by changing `pending` to `it`.

## Source

Inspired by the 'Deaf Grandma' exercise in Chris Pine's Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=06

## Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

### bob_spec.cr

``````require "spec"
require "../src/*"

describe "Bob" do
describe "#hey" do
it "responds to stating something" do
Bob.hey("Tom-ay-to, tom-aaaah-to.").should eq "Whatever."
end

pending "responds to shouting something" do
Bob.hey("WATCH OUT!").should eq "Whoa, chill out!"
end

pending "responds to asking a question" do
Bob.hey("Does this cryogenic chamber make me look fat?").should eq "Sure."
end

pending "responds to talking forcefully" do
Bob.hey("Let\'s go make out behind the gym!").should eq "Whatever."
end

pending "responds to using acronyms in regular speech" do
Bob.hey("It\'s OK if you don\'t want to go to the DMV.").should eq "Whatever."
end

pending "responds to forceful questions" do
Bob.hey("WHAT THE HELL WERE YOU THINKING?").should eq "Calm down, I know what I'm doing!"
end

pending "responds to shouting numbers" do
Bob.hey("1, 2, 3 GO!").should eq "Whoa, chill out!"
end

pending "responds to only numbers" do
Bob.hey("1, 2, 3").should eq "Whatever."
end

pending "responds to question with only numbers" do
Bob.hey("4?").should eq "Sure."
end

pending "responds to shouting with special characters" do
Bob.hey("ZOMG THE %^*@#\$(*^ ZOMBIES ARE COMING!!11!!1!").should eq "Whoa, chill out!"
end

pending "responds to shouting with no exclamation mark" do
Bob.hey("I HATE YOU").should eq "Whoa, chill out!"
end

pending "responds to statement containing question mark" do
Bob.hey("Ending with a ? means a question.").should eq "Whatever."
end

pending "responds to prattling on" do
Bob.hey("Wait! Hang on.  Are you going to be OK?").should eq "Sure."
end

pending "responds to silence" do
Bob.hey("").should eq "Fine. Be that way!"
end

pending "responds to prolonged silence" do
Bob.hey("   ").should eq "Fine. Be that way!"
end
end
end``````
``````class Bob
empty:             "Fine. Be that way!",
forceful_question: "Calm down, I know what I'm doing!",
question:          "Sure.",
shout:             "Whoa, chill out!",
default:           "Whatever.",
}

def self.hey(phrase : String)
case Bob.new(phrase)
in .empty?             then ANSWERS[:empty]
in .forceful_question? then ANSWERS[:forceful_question]
in .question?          then ANSWERS[:question]
in .shouting?          then ANSWERS[:shout]
in Bob                 then ANSWERS[:default]
end
end

def initialize(@phrase : String)
end

getter?(empty : Bool) { @phrase.blank? }

getter?(forceful_question : Bool) { question? && shouting? }

getter?(question : Bool) { @phrase.ends_with?("?") }

getter?(shouting : Bool) { @phrase.gsub(/[^a-z]*[A-Z][^a-z]*/) { "" }.empty? }
end``````

### What can you learn from this solution?

A huge amount can be learned from reading other peopleâ€™s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

• What compromises have been made?
• Are there new concepts here that you could read more about to improve your understanding?