🎉 Exercism Research is now launched. Help Exercism, help science and have some fun at research.exercism.io 🎉
Avatar of remcopeereboom

remcopeereboom's solution

to Acronym in the Ruby Track

Published at Jul 13 2018 · 5 comments
Instructions
Test suite
Solution

Note:

This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code was written.

Convert a phrase to its acronym.

Techies love their TLA (Three Letter Acronyms)!

Help generate some jargon by writing a program that converts a long name like Portable Network Graphics to its acronym (PNG).


For installation and learning resources, refer to the exercism help page.

For running the tests provided, you will need the Minitest gem. Open a terminal window and run the following command to install minitest:

gem install minitest

If you would like color output, you can require 'minitest/pride' in the test file, or note the alternative instruction, below, for running the test file.

Run the tests from the exercise directory using the following command:

ruby acronym_test.rb

To include color from the command line:

ruby -r minitest/pride acronym_test.rb

Source

Julien Vanier https://github.com/monkbroc

Submitting Incomplete Solutions

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

acronym_test.rb

require 'minitest/autorun'
require_relative 'acronym'

# Common test data version: 1.1.0 cae7ae1
class AcronymTest < Minitest::Test
  def test_basic
    # skip
    assert_equal "PNG", Acronym.abbreviate('Portable Network Graphics')
  end

  def test_lowercase_words
    skip
    assert_equal "ROR", Acronym.abbreviate('Ruby on Rails')
  end

  def test_punctuation
    skip
    assert_equal "FIFO", Acronym.abbreviate('First In, First Out')
  end

  def test_all_caps_words
    skip
    assert_equal "PHP", Acronym.abbreviate('PHP: Hypertext Preprocessor')
  end

  def test_non_acronym_all_caps_word
    skip
    assert_equal "GIMP", Acronym.abbreviate('GNU Image Manipulation Program')
  end

  def test_hyphenated
    skip
    assert_equal "CMOS", Acronym.abbreviate('Complementary metal-oxide semiconductor')
  end

  # Problems in exercism evolve over time, as we find better ways to ask
  # questions.
  # The version number refers to the version of the problem you solved,
  # not your solution.
  #
  # Define a constant named VERSION inside of the top level BookKeeping
  # module, which may be placed near the end of your file.
  #
  # In your file, it will look like this:
  #
  # module BookKeeping
  #   VERSION = 1 # Where the version number matches the one in the test.
  # end
  #
  # If you are curious, read more about constants on RubyDoc:
  # http://ruby-doc.org/docs/ruby-doc-bundle/UsersGuide/rg/constants.html

  def test_bookkeeping
    skip
    assert_equal 4, BookKeeping::VERSION
  end
end
module Acronym
  VERSION = 1

  def self.abbreviate(string)
    all_caps = '[[:upper:]][[:upper:]]+'
    camel_case = '[[:upper:]][[:lower:]]+'
    lower_case = '[[:lower:]]+'

    match_words = /#{all_caps}|#{camel_case}|#{lower_case}/
    string.scan(match_words).map { |word| word[0].upcase }.join
  end
end

Community comments

Find this solution interesting? Ask the author a question to learn more.
Avatar of remcopeereboom

This is probably not the most readable solution. It might be a good idea to really encode the rules for abbreviating in some methods. But I'm not sure if the problem warrants it.

Avatar of tenebrousedge

I used a slightly more complicated regex. /\b\w|(?<=[a-z])[A-Z]/

This snags word characters that appear after word boundaries (i.e. first letters of each word) OR uppercase letters that appear after lowercase letters.

It's probably simpler to do map(&:first).join.upcase

Avatar of remcopeereboom

@tenebrousedge

This [the regex] snags word characters that appear after word boundaries (i.e. first letters of each word) OR uppercase letters that appear after lowercase letters.

The magic of backreferences :). They always make my mind hurt. I'm not sure whether the requirements wants us to add the uppercase letters after lowercase letters or not. It depends a bit on the requirements. You might want to submit an issue for clarification on the exercism github repositories.

It's probably simpler to do map(&:first).join.upcase

I love that. That's so descriptive.

Avatar of tenebrousedge

The magic of backreferences :). They always make my mind hurt.

This does represent the limits of my regex ability, yes :) I failed to accomplish something similar with the 'Bob' problem.

I'm not sure whether the requirements wants us to add the uppercase letters after lowercase letters or not. It depends a bit on the requirements. You might want to submit an issue for clarification on the exercism github repositories.

One of the tests covers this in version 2.

It's probably simpler to do map(&:first).join.upcase

I love that. That's so descriptive.

"The praise of the praiseworthy is above all rewards." - J.R.R. Tolkien

Avatar of remcopeereboom

One of the tests covers this in version 2.

Figures... :)

What can you learn from this solution?

A huge amount can be learned from reading other people’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?