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@noriaki
Created March 4, 2013 21:57
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tapを使ってメソッドチェインの途中の値をログ出力する ref: http://qiita.com/items/c94f57047560deea09ba
"Test".upcase.reverse.next.swapcase
# => "tseu"
"Test".upcase.tap{|s| p s }.reverse.tap{|s| p s }.next.tap{|s| p s }.swapcase
"TEST"
"TSET"
"TSEU"
# => "tseu"
"Test".upcase.tap{|s| Rails.logger.debug s }.reverse.next.swapcase
# => "tseu"
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