automated commit

Author: jairovelasquez

.gitignore

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+.idea

.rspec

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+--format documentation
+--color

.ruby-version

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+2.6.6

Gemfile

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+source 'http://rubygems.org'
+
+ruby "2.6.6"
+
+gem 'rspec', '~> 3.8'
+gem 'cucumber', '2.0.0'
+
+gem 'byebug'

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    builder (3.2.4)
+    byebug (11.1.3)
+    cucumber (2.0.0)
+      builder (>= 2.1.2)
+      cucumber-core (~> 1.1.3)
+      diff-lcs (>= 1.1.3)
+      gherkin (~> 2.12)
+      multi_json (>= 1.7.5, < 2.0)
+      multi_test (>= 0.1.2)
+    cucumber-core (1.1.3)
+      gherkin (~> 2.12.0)
+    diff-lcs (1.3)
+    gherkin (2.12.2)
+      multi_json (~> 1.3)
+    multi_json (1.15.0)
+    multi_test (0.1.2)
+    rspec (3.8.0)
+      rspec-core (~> 3.8.0)
+      rspec-expectations (~> 3.8.0)
+      rspec-mocks (~> 3.8.0)
+    rspec-core (3.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-expectations (3.8.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.8.0)
+    rspec-mocks (3.8.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.8.0)
+    rspec-support (3.8.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  byebug
+  cucumber (= 2.0.0)
+  rspec (~> 3.8)
+
+RUBY VERSION
+   ruby 2.6.6p146
+
+BUNDLED WITH
+   1.17.3

README.md

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+Ruby Intro
+=============
+
+This 3-part homework gives some basic practice in Ruby as well as
+getting you accustomed to making testing a regular part of your workflow.
+
+**NOTE: If you are working on a local computer, do not clone this repo to your workspace. Fork it first, then clone your fork.**
+
+
+Learning Goals
+--------------
+After completing this assignment, you will know how to:
+
+* Write simple code that uses basic constructs in the Ruby language, including methods and arguments, conditionals, string and array manipulation, regular expressions, and basic object-oriented programming mechanisms
+* Understand the Ruby project conventions for where code files and test files are located in a project's directory hierarchy
+* Run individual tests or suites of tests using the RSpec unit testing tool
+* Understand the basic syntax of RSpec unit tests
+ 
+Overview
+--------
+
+**You may find the [Ruby documentation at ruby-doc.org](https://ruby-doc.org) helpful to have on hand.**
+
+The repo for this assigment follows a fairly standard Ruby convention for codebases: the code
+files are stored in `lib/` and the test files are stored in `spec/`.
+(We use the RSpec unit-testing framework; if we were using Ruby's default
+framework, known as `Test::Unit`, the test files would be under
+`test/`.)
+
+**We've placed "starter code" in `lib/ruby_intro.rb`; when you're all done, you
+can submit this single file to the autograder.**
+
+However, you can test each of the 3 parts separately.  The files
+`spec/part[123]_spec.rb` contain RSpec tests for each of the three
+parts.  For example, to test your answers to Part 1, say `rspec
+spec/part1_spec.rb`.  `rspec` with no arguments runs the tests in all
+the files `spec/*_spec.rb`.
+
+* The line numbers in the RSpec error report will
+give you guidance as to which tests failed.  (You can check the [RSpec
+documentation](http://rspec.info) to see how the `.rspec` file can be
+used to customize the output format.)
+
+If you are working in Codio, you are ready to move on to the next part. If you are working on a local computer, proceed with the following steps.
+
+| Local computer setup |
+|-----|
+Ensure that Ruby 2.6.6 is installed.
+
+To ensure you have the rspec gem installed you need bundler and can then 
+run bundle install like so:
+```sh
+$ gem install bundler
+$ cd assignment
+$ bundle
+```
+When the above completes successfully you'll have RSpec installed and can
+run `rspec` from the command line to test your code.
+
+# 1. Arrays, Hashes, and Enumerables
+
+Check the [Ruby 2.x documentation](http://ruby-doc.org) on `Array`,
+`Hash` and `Enumerable` as they could help tremendously with these
+exercises. Various Ruby cheatsheets are also helpful as a quick reference! Although Ruby supports looping constructs like 'for' and 'while', consider using block syntax with each for a more idiomatic use of Ruby. :-) 
+
+0. Define a method `sum(array)` that takes an array of integers as an argument and returns the sum of its elements. For an empty array it should return zero.  Run associated tests via:  `$ rspec -e '#sum ' spec/part1_spec.rb` (Make sure you are in the correct directory: `cd assignment` and rspec is installed)
+
+0. Define a method `max_2_sum(array)` which takes an array of integers as an argument and returns the sum of its two largest elements. For an empty array it should return zero. For an array with just one element, it should return that element (Consider if the two largest elements are the same value as well). Run associated tests via:  `$ rspec -e '#max_2_sum' spec/part1_spec.rb`
+
+0. Define a method `sum_to_n?(array, n)` that takes an array of integers and an additional integer, n, as arguments and returns true if any two elements in the array of integers sum to n. `sum_to_n?([], n)` should return false for any value of n, by definition. Run associated tests via:  `$ rspec -e '#sum_to_n' spec/part1_spec.rb` 
+
+You can check your progress on all of the above by running `$ rspec spec/part1_spec.rb`.
+
+
+# 2. Strings and Regular Expressions
+
+Check the documentation on String and Regexp as they could help tremendously with these exercises. For future reference as well, check out https://rubular.com/ for regex related queries. :-)
+
+0. Define a method `hello(name)` that takes a string representing a name and returns the string "Hello, " concatenated with the name. Run associated tests via:  `$ rspec -e '#hello' spec/part2_spec.rb` (Make sure you are in the correct directory: `cd assignment`)
+
+0. Define a method `starts_with_consonant?(s)` that takes a string and returns true if it starts with a consonant and false otherwise. (For our purposes, a consonant is any English letter other than A, E, I, O, U.) Make sure it works for both upper and lower case and for non-letters. Run associated tests via:  `$ rspec -e '#starts_with_consonant?' spec/part2_spec.rb`
+
+0. Define a method `binary_multiple_of_4?(s)` that takes a string and returns true if the string represents a binary number that is a multiple of 4, such as '1000'. Make sure it returns false if the string is not a valid binary number. Run associated tests via:  `$ rspec -e '#binary_multiple_of_4?' spec/part2_spec.rb`
+
+You can check your progress on all of the above by running `$ rspec spec/part2_spec.rb`.
+
+
+# 3. Object Oriented Basics
+
+
+Define a class `BookInStock` which represents a book with an ISBN number, `isbn`, and price of the book as a floating-point number, `price`, as attributes. Run associated tests via:  `$ rspec -e 'getters and setters' spec/part3_spec.rb` (Make sure you are in the correct directory: `cd assignment`)
+
+The constructor should accept the ISBN number (a string, since in real life ISBN numbers can begin with zero and can include hyphens) as the first argument and price as second argument, and should raise `ArgumentError` (one of Ruby's built-in exception types) if the ISBN number is the empty string or if the price is less than or equal to zero.  Include the proper getters and setters for these attributes. Run associated tests via:  `$ rspec -e 'constructor' spec/part3_spec.rb`
+
+Include a method `price_as_string` that returns the price of the book formatted with a leading dollar sign and two decimal places, that is, a price of 20 should format as `$20.00` and a price of 33.8 should format as `$33.80`. Check out formatted string methods in Ruby. Run associated tests via:  `$ rspec -e '#price_as_string' spec/part3_spec.rb`
+
+You can check your progress on all of the above by running `rspec spec/part3_spec.rb`.
+
+
+## More Challenges
+
+* Try getting setup with 
+an automated test framework such as [guard](http://code.tutsplus.com/tutorials/testing-your-ruby-code-with-guard-rspec-pry--cms-19974) or [autotest](https://rubygems.org/gems/autotest).  Guard or AutoTest can be set up so that 
+they will run all the tests in `spec/`, but every time you edit and save 
+your code file, the tests are automatically re-run, so you don't have to 
+run them manually.  As we'll see later, this is the "watch the test fail" 
+part of the TDD or test-driven process of development: write the tests before
+you write the code, watch the test fail, fill in the code and save the code file, 
+then watch the test pass!
+
+* Try pairing using the [one-undermanship pair programming style](http://www.agileventures.org/remote-pair-programming/pair-programming-protocols)

lib/ruby_intro.rb

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+# When done, submit this entire file to the autograder.
+
+# Part 1
+
+def sum(arr)
+  # YOUR CODE HERE
+end
+
+def max_2_sum(arr)
+  # YOUR CODE HERE
+end
+
+def sum_to_n?(arr, n)
+  # YOUR CODE HERE
+end
+
+# Part 2
+
+def hello(name)
+  # YOUR CODE HERE
+end
+
+def starts_with_consonant?(s)
+  # YOUR CODE HERE
+end
+
+def binary_multiple_of_4?(s)
+  # YOUR CODE HERE
+end
+
+# Part 3
+
+class BookInStock
+  # YOUR CODE HERE
+end

spec/part1_spec.rb

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+# frozen_string_literal: true
+
+require_relative '../lib/ruby_intro'
+
+describe 'Ruby intro part 1' do
+  describe '#sum' do
+    it 'is defined' do
+      expect { sum([1, 3, 4]) }.not_to raise_error
+    end
+
+    it 'returns correct sum [20 points]', points: 20 do
+      expect(sum([1, 2, 3, 4, 5])).to be_a Integer
+      expect(sum([1, 2, 3, 4, 5])).to eq(15)
+      expect(sum([1, 2, 3, 4, -5])).to eq(5)
+      expect(sum([1, 2, 3, 4, -5, 5, -100])).to eq(-90)
+    end
+
+    it 'works on the empty array [10 points]', points: 10 do
+      expect { sum([]) }.not_to raise_error
+      expect(sum([])).to be_zero
+    end
+  end
+
+  describe '#max_2_sum' do
+    it 'is defined' do
+      expect { max_2_sum([1, 2, 3]) }.not_to raise_error
+    end
+
+    it 'returns the correct sum [7 points]', points: 7 do
+      expect(max_2_sum([1, 2, 3, 4, 5])).to be_a Integer
+      expect(max_2_sum([1, 2, 3, 4, 5])).to eq(9)
+      expect(max_2_sum([1, -2, -3, -4, -5])).to eq(-1)
+    end
+
+    it 'works even if 2 largest values are the same [3 points]', points: 3 do
+      expect(max_2_sum([1, 2, 3, 3])).to eq(6)
+    end
+
+    it 'returns zero if array is empty [10 points]', points: 10 do
+      expect(max_2_sum([])).to be_zero
+    end
+
+    it 'returns value of the element if just one element [10 points]', points: 10 do
+      expect(max_2_sum([3])).to eq(3)
+    end
+  end
+
+  describe '#sum_to_n' do
+    it 'is defined' do
+      expect { sum_to_n?([1, 2, 3], 4) }.not_to raise_error
+    end
+
+    it 'returns true when any two elements sum to the second argument [30 points]', points: 30 do
+      expect(sum_to_n?([1, 2, 3, 4, 5], 5)).to be true # 2 + 3 = 5
+      expect(sum_to_n?([3, 0, 5], 5)).to be true # 0 + 5 = 5
+      expect(sum_to_n?([-1, -2, 3, 4, 5, -8], -3)).to be true  # handles negative sum
+      expect(sum_to_n?([-1, -2, 3, 4, 5, -8], 12)).to be false # 3 + 4 + 5 = 12 (not 3 elements)
+      expect(sum_to_n?([-1, -2, 3, 4, 6, -8], 12)).to be false # no two elements that sum
+    end
+
+    it 'returns false for any single element array [5 points]', points: 5 do
+      expect(sum_to_n?([0], 0)).to be false
+      expect(sum_to_n?([1], 1)).to be false
+      expect(sum_to_n?([-1], -1)).to be false
+      expect(sum_to_n?([-3], 0)).to be false
+    end
+
+    it 'returns false for an empty array [5 points]', points: 5 do
+      expect(sum_to_n?([], 0)).to be false
+      expect(sum_to_n?([], 7)).to be false
+    end
+  end
+end

spec/part2_spec.rb

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+# frozen_string_literal: true
+
+require_relative '../lib/ruby_intro'
+
+describe '#hello' do
+  it 'is defined' do
+    expect { hello('Testing') }.not_to raise_error # ::NoMethodError)
+  end
+
+  it 'The hello method returns the correct string [30 points]', points: 30 do
+    expect(hello('Dan').class).to eq(String)
+    expect(hello('Dan')).to eq('Hello, Dan'), 'Incorrect results for input: "Dan"'
+    expect(hello('BILL')).to eq('Hello, BILL'), 'Incorrect results for input: "BILL"'
+    expect(hello('Mr. Ilson')).to eq('Hello, Mr. Ilson'), 'Incorrect results for input: "Mr. Ilson"'
+  end
+end
+
+describe '#starts_with_consonant?' do
+  it 'is defined' do
+    expect { starts_with_consonant?('d') }.not_to raise_error # ::NoMethodError)
+  end
+
+  it 'classifies true cases [10 points]', points: 10 do
+    expect(starts_with_consonant?('v')).to be_truthy, "'v' is a consonant"
+    %w[v vest Veeee crypt].each do |string|
+      expect(starts_with_consonant?(string)).to be_truthy, "Incorrect results for input: \"#{string}\""
+    end
+  end
+
+  it 'classifies false cases [10 points]', points: 10 do
+    expect(starts_with_consonant?('a')).to be_falsy, "'a' is not a consonant"
+    %w[asdfgh Unix].each do |string|
+      expect(starts_with_consonant?(string)).to be_falsy, "Incorrect results for input: \"#{string}\""
+    end
+  end
+
+  it 'works on the empty string [5 points]', points: 5 do
+    expect(starts_with_consonant?('')).to be_falsy
+  end
+
+  it 'works on nonletters [5 points]', points: 5 do
+    expect(starts_with_consonant?('#foo')).to be_falsy
+  end
+end
+
+describe '#binary_multiple_of_4?' do
+  it 'is defined' do
+    expect { binary_multiple_of_4?('yes') }.not_to raise_error # ::NoMethodError)
+  end
+
+  it 'classifies valid binary numbers [30 points]', points: 30 do
+    %w[1010101010100 0101010101010100 100 0].each do |string|
+      expect(binary_multiple_of_4?(string)).to be_truthy, "Incorrect results for input: \"#{string}\""
+    end
+    %w[101 1000000000001].each do |string|
+      expect(binary_multiple_of_4?(string)).not_to be_truthy, "Incorrect results for input: \"#{string}\""
+    end
+  end
+
+  it 'rejects invalid binary numbers [10 points]', points: 10 do
+    expect(binary_multiple_of_4?('a100')).to be_falsy, "'a100' is not a valid binary number!"
+    expect(binary_multiple_of_4?('')).to be_falsy, 'The empty string is not a valid binary number!'
+  end
+end