Add Elixir American Flag

meetings/2015-07-13/README.md

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+# Programming Puzzle Night
+
+```ruby
+#!/usr/bin/env ruby
+#
+# This goal of this RubyLoCo Puzzle is to generate an ascii
+# American Flag. Try to come up with a unique way to generate
+# the flag. Below is the easiest implementation.
+#
+# Ruby not required! Use any langauge and pair up!
+#
+# If you complete the task here are some more advanced ideas:
+# make the flag colored
+# write a DSL to generate any flag
+# animate the flag
+# add a flag pole
+# use emoji
+#
+# Happy Birthday America
+
+puts '* * * * * * ' + '1111111111111111111111111111111111111111111'
+puts ' * * * * *  ' + '0000000000000000000000000000000000000000000'
+puts '* * * * * * ' + '1111111111111111111111111111111111111111111'
+puts ' * * * * *  ' + '0000000000000000000000000000000000000000000'
+puts '* * * * * * ' + '1111111111111111111111111111111111111111111'
+puts ' * * * * *  ' + '0000000000000000000000000000000000000000000'
+puts '* * * * * * ' + '1111111111111111111111111111111111111111111'
+puts '0000000000000000000000000000000000000000000000000000000'
+puts '1111111111111111111111111111111111111111111111111111111'
+puts '0000000000000000000000000000000000000000000000000000000'
+puts '1111111111111111111111111111111111111111111111111111111'
+puts '0000000000000000000000000000000000000000000000000000000'
+puts '1111111111111111111111111111111111111111111111111111111'
+
+```

meetings/2015-07-13/kirsche_kevin/american_flag.exs

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+defmodule Recursion do
+  require Integer
+  # Recursion for star rows
+  def print_star_row_pair_n_minus_1_times(n) when n <= 1 do
+    print_row AmericanFlag.star_row(IO.ANSI.white_background)
+  end
+
+  def print_star_row_pair_n_minus_1_times(n) do
+    print_row AmericanFlag.star_row(IO.ANSI.white_background)
+    print_row AmericanFlag.star_row(IO.ANSI.red_background)
+    print_star_row_pair_n_minus_1_times(n-1)
+  end
+
+  # Recursion for color rows
+  def print_color_row_n_times(n) when n <= 1 do
+    print_row AmericanFlag.color_row(IO.ANSI.white_background)
+  end
+
+  def print_color_row_n_times(n) do
+    if Integer.is_even n do
+      print_row AmericanFlag.color_row(IO.ANSI.red_background)
+    else
+      print_row AmericanFlag.color_row(IO.ANSI.white_background)
+    end
+    print_color_row_n_times(n-1)
+  end
+
+  # Allow printing of a single row N times
+  def print_row_n_times(msg, n) when n <= 1 do
+    :ok = IO.write msg <> ansi_reset
+  end
+
+  def print_row_n_times(msg, n) do
+    :ok = IO.write msg <> ansi_reset
+    print_row_n_times(msg, n-1)
+  end
+
+  # Helper Methods
+  defp ansi_reset do
+    "#{IO.ANSI.reset}" <> "\n"
+  end
+
+  defp print_row(msg) do
+    :ok = IO.write msg <> ansi_reset
+  end
+end
+
+defmodule AmericanFlag do
+  def star_row(background) do
+    "#{IO.ANSI.white}#{IO.ANSI.blue_background} *   *   *   *   *   *  " <>
+      "#{background}" <> String.duplicate(" ", 45)
+  end
+
+  def color_row(color) do
+    "#{color}" <> String.duplicate(" ", 69)
+  end
+end
+
+Recursion.print_star_row_pair_n_minus_1_times(5)
+Recursion.print_color_row_n_times(6)
+Recursion.print_row_n_times("#{IO.ANSI.white}#{IO.ANSI.black_background}| |", 12)