an example using classes

katas/autovivification/agoddard.rb

@@ -0,0 +1,94 @@
+#!/usr/bin/env ruby
+require 'json'
+input = 
+"14305 1 open
+16595 2 proj
+16863 2 proj
+17200 3 proj
+18787 2 proj
+19329 4 proj
+19554 1 open
+19810 2 proj
+19997 1 open
+21143 2 open
+22101 2 open
+22307 2 open
+22400 2 open
+23225 2 proj
+23278 6 proj
+24201 2 proj
+24447 2 proj
+24909 3 proj
+25572 2 proj
+25858 2 new
+26080 1 open
+26368 6 open
+26565 1 open
+26591 5 open
+26787 1 open
+26957 2 open
+26982 1 open
+27289 0 open
+27758 5 open
+27827 0 new
+27924 0 new
+27998 0 new"
+
+class Issue
+  attr_accessor :id, :priority, :type
+
+  def initialize(logline)
+    @id,@priority,@type = logline.split
+  end
+end
+
+#we need a collection which we can search within and iterate over
+class Issues < Array
+  #grab all the ids of the Issues
+  def ids
+    self.collect{|issue| issue.id}.sort
+  end
+  #grab a list of priorities used in the issues
+  def priorities
+    self.collect{|issue| issue.priority}.uniq.sort
+  end
+  #grab a list of types used in the issues
+  def types
+    self.collect{|issue| issue.type}.uniq
+  end
+  #find issues by type
+  def find_by_type(type)
+    self.select{|issue| issue.type == type}
+  end
+end
+
+
+#load the input data, making one Issue from each log line
+issues = Issues.new
+input.lines.to_a.each{|line| issues << Issue.new(line)}
+
+#data1 (count issues by type)
+data1 = Hash.new
+issues.types.each do |type|
+  data1[type] = issues.find_by_type(type).count
+end
+
+#data2 (print issue ids for each type)
+data2 = Hash.new
+issues.types.each do |type|
+  ids = []
+  issues.find_by_type(type).each do |issue|
+    ids << issue.id
+  end
+  data2[type] = ids
+end
+
+#data3 (combine data1 and data2 in single output)
+data3 = {:id_by_type => data2, :count => data1}
+
+
+#data4 (list all issue ids)
+data4 = []
+data4 << issues.ids
+
+puts JSON.pretty_generate([data1,data2,data3,data4])