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kasei-san/file0.txt

Created July 26, 2014 03:13
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file0.txt
アルゴリズムを実行時に選択することができるデザインパターンである。
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strategy.rb
class StringLister
attr_reader :items
def initialize(items, &strategy)
@items = items
@strategy = strategy
end
def display
@strategy.call(@items)
end
end
items = %w[abc def ghi]
disp = StringLister.new(items) do |items|
result = []
result << "<html><body>"
items.each{|item| result << "<div>#{item}</div>" }
result << "</body></html>"
result.join("\n")
end.display
puts disp
# <html><body>
# <div>abc</div>
# <div>def</div>
# <div>ghi</div>
# </body></html>
disp = StringLister.new(items) do |items|
items.join("\n")
end.display
puts disp
# abc
# def
# ghi
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