pig_latin_translator.rb

class PigLatinTranslator
  def translate(word)
    if /\Ay/.match(word)
      word.slice!(0)
      word + "yay"
    elsif match = /\A[^aeiouy]+/.match(word)
      consonants = match.to_s.length
      ending = word.slice!(0, consonants) + "ay"
      word + ending
    else
      word + "way"
    end
  end
end

pig_latin_translator_spec.rb

require 'rspec'
require 'pry'
require_relative '../lib/pig_latin_translator.rb'

describe PigLatinTranslator do
  let(:translator) { PigLatinTranslator.new }
  describe '#translate' do
    context "the word begins with consonants" do
      it "removes leading consonants before first vowel, appending consonants + 'ay' to the end of the word" do
        expect(translator.translate("glove")).to eq("oveglay")
      end
    end

    context "the word begins with vowels" do
      it "adds 'way' to the end of the word" do
        expect(translator.translate("egg")).to eq("eggway")
      end
    end

    context "'y' is encountered before a vowel" do
      context "'y' is the first letter in the word" do
        it "removes 'y' and appends it to the end of the string followed by 'ay'" do
          expect(translator.translate("yellow")).to eq("ellowyay")
        end
      end

      context "'y' is not the first letter in the word" do
        it "removes the preceding consonants and appends them to the end of the word followed by 'ay'" do
          expect(translator.translate("rhythm")).to eq("ythmrhay")
        end
      end
    end
  end
end