Update koans

Author: tongkiat

koans/README.rdoc

@@ -1,4 +1,4 @@
-= Neo Ruby Koans
+= Ruby Koans
 
 The Ruby Koans walk you along the path to enlightenment in order to learn Ruby.
 The goal is to learn the Ruby language, syntax, structure, and some common
@@ -98,7 +98,7 @@ The very first time you run the koans you will see the following output:
     path_to_enlightenment.rb:38
 
     mountains are merely mountains
-    your path thus far [X_________________________________________________] 0/280
+    your path thus far [X_________________________________________________] 0/280 (0%)
 
 You have come to your first stage. Notice it is telling you where to look for
 the first solution:
@@ -149,7 +149,7 @@ Install the Ruby gem (library) called +observr+ and then ask it to
     rake
     # decide to run rake automatically from now on as you edit
     gem install observr
-    observr ./koans/koans.watchr
+    observr ./koans.watchr
 
 == Inspiration
 
@@ -179,7 +179,7 @@ Brian Marick's fantastic guide for beginners Everyday Scripting with Ruby    ::
 
 Author         :: Jim Weirich <jim@neo.org>
 Author         :: Joe O'Brien <joe@objo.com>
-Issue Tracker  :: http://www.pivotaltracker.com/projects/48111
+Issue Tracker  :: https://github.com/edgecase/ruby_koans/issues
 Requires       :: Ruby 1.8.x or later and Rake (any recent version)
 
 = License

koans/about_array_assignment.rb

@@ -24,7 +24,7 @@ def test_parallel_assignments_with_splat_operator
     assert_equal __, last_name
   end
 
-  def test_parallel_assignments_with_too_few_variables
+  def test_parallel_assignments_with_too_few_values
     first_name, last_name = ["Cher"]
     assert_equal __, first_name
     assert_equal __, last_name

koans/about_hashes.rb

@@ -113,4 +113,14 @@ def test_default_value_with_block
     assert_equal __, hash[:two]
     assert_equal __, hash[:three]
   end
+
+  def test_default_value_attribute
+    hash = Hash.new
+
+    assert_equal __, hash[:some_key]
+
+    hash.default = 'peanut'
+
+    assert_equal __, hash[:some_key]
+  end
 end

koans/about_iteration.rb

@@ -14,7 +14,7 @@ def as_name(name)
     end
   end
 
-  in_ruby_version("1.9", "2") do
+  in_ruby_version("1.9", "2", "3") do
     def as_name(name)
       name.to_sym
     end

koans/about_keyword_arguments.rb

@@ -24,8 +24,20 @@ def test_keyword_arguments_with_wrong_number_of_arguments
     assert_match(/__/, exception.message)
   end
 
-  # THINK ABOUT IT:
-  #
-  # Keyword arguments always have a default value, making them optional to the caller
+  def method_with_mandatory_keyword_arguments(one:, two: 'two')
+    [one, two]
+  end
+
+  def test_mandatory_keyword_arguments
+    assert_equal __, method_with_mandatory_keyword_arguments(one: 'one')
+    assert_equal __, method_with_mandatory_keyword_arguments(two: 2, one: 1)
+  end
+
+  def test_mandatory_keyword_arguments_without_mandatory_argument
+    exception = assert_raise(___) do
+      method_with_mandatory_keyword_arguments
+    end
+    assert_match(/__/, exception.message)
+  end
 
 end

koans/about_open_classes.rb

@@ -30,14 +30,14 @@ def test_after_reopening_dogs_can_both_wag_and_bark
   # ------------------------------------------------------------------
 
   class ::Integer
-    def even?
-      (self % 2) == 0
+    def answer_to_life_universe_and_everything?
+      self == 42
     end
   end
 
   def test_even_existing_built_in_classes_can_be_reopened
-    assert_equal __, 1.even?
-    assert_equal __, 2.even?
+    assert_equal __, 1.answer_to_life_universe_and_everything?
+    assert_equal __, 42.answer_to_life_universe_and_everything?
   end
 
   # NOTE: To understand why we need the :: before Integer, you need to

koans/about_strings.rb

@@ -159,7 +159,7 @@ def test_in_older_ruby_single_characters_are_represented_by_integers
     end
   end
 
-  in_ruby_version("1.9", "2") do
+  in_ruby_version("1.9", "2", "3") do
     def test_in_modern_ruby_single_characters_are_represented_by_strings
       assert_equal __, ?a
       assert_equal __, ?a == 97

koans/neo.rb

@@ -70,7 +70,7 @@ def ____(method=nil)
     end
   end
 
-  in_ruby_version("1.9", "2") do
+  in_ruby_version("1.9", "2", "3") do
     public :method_missing
   end
 end
@@ -218,15 +218,15 @@ def initialize
 
     def add_progress(prog)
       @_contents = nil
-      exists = File.exists?(PROGRESS_FILE_NAME)
+      exists = File.exist?(PROGRESS_FILE_NAME)
       File.open(PROGRESS_FILE_NAME,'a+') do |f|
         f.print "#{',' if exists}#{prog}"
       end
     end
 
     def progress
       if @_contents.nil?
-        if File.exists?(PROGRESS_FILE_NAME)
+        if File.exist?(PROGRESS_FILE_NAME)
           File.open(PROGRESS_FILE_NAME,'r') do |f|
             @_contents = f.read.to_s.gsub(/\s/,'').split(',')
           end

koans/path_to_enlightenment.rb

@@ -3,21 +3,21 @@
 $LOAD_PATH << File.dirname(__FILE__)
 
 require 'about_asserts'
-require 'about_nil'
-require 'about_objects'
+require 'about_true_and_false'
+require 'about_strings'
+require 'about_symbols'
 require 'about_arrays'
 require 'about_array_assignment'
+require 'about_objects'
+require 'about_nil'
 require 'about_hashes'
-require 'about_strings'
-require 'about_symbols'
-require 'about_regular_expressions'
 require 'about_methods'
-in_ruby_version("2") do
+in_ruby_version("2", "3") do
   require 'about_keyword_arguments'
 end
 require 'about_constants'
+require 'about_regular_expressions'
 require 'about_control_statements'
-require 'about_true_and_false'
 require 'about_triangle_project'
 require 'about_exceptions'
 require 'about_triangle_project_2'
@@ -38,4 +38,7 @@
 in_ruby_version("jruby") do
   require 'about_java_interop'
 end
+in_ruby_version("2.7") do
+  require 'about_pattern_matching'
+end
 require 'about_extra_credit'