Created
March 24, 2011 02:02
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require 'ostruct' | |
class HockeyClient | |
def listen_for_hockey_scores | |
return enum_for(:listen_for_hockey_scores) unless block_given? | |
sleep 1 | |
yield score "Blues", "Cracknell" | |
sleep 0.1 | |
yield score "Red Wings", "Salei" | |
sleep 0.1 | |
yield score "Red Wings", "Helm" | |
sleep 1 | |
yield score "Red Wings", "Kronwall" | |
sleep 0.1 | |
yield score "Blues", "Backes" | |
sleep 0.2 | |
yield score "Blues", "D'Agostini" | |
sleep 0.2 | |
yield score "Red Wings", "Datsyuk" | |
sleep 0.1 | |
yield score "Red Wings", "Abdelkader" | |
end | |
private | |
def score(team, scorer) | |
OpenStruct.new :team => team, :scorer => scorer | |
end | |
end | |
if $0 == __FILE__ | |
hockey_client = HockeyClient.new | |
puts "Listening to the game..." | |
hockey_client.listen_for_hockey_scores do |goal| | |
puts "#{goal.scorer} scored a goal for #{goal.team}" | |
end | |
puts "The game is over." | |
end |
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require './hockey_client' | |
module Enumerable | |
def lazy_select(&block) | |
Enumerator.new do |yielder| | |
self.each do |element| | |
yielder << element if yield(element) | |
end | |
end | |
end | |
def lazy_map(&block) | |
Enumerator.new do |yielder| | |
self.each do |element| | |
yielder << yield(element) | |
end | |
end | |
end | |
end | |
class RedWingsFan | |
def initialize(hockey_client) | |
@hockey_client = hockey_client | |
end | |
def red_wings_goal_scorers | |
@hockey_client.listen_for_hockey_scores.lazy_select do |goal| | |
goal.team == "Red Wings" | |
end.lazy_map do |goal| | |
goal.scorer | |
end | |
end | |
end | |
red_wings_fan = RedWingsFan.new(HockeyClient.new) | |
puts "Red Wings scorers:" | |
red_wings_fan.red_wings_goal_scorers.each do |scorer| | |
puts scorer | |
end |
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