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配列の要素をランキングする
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class Array | |
def ranks | |
rank = self.sort.reverse | |
self.map {|n| rank.index(n) + 1 } | |
end | |
end | |
describe Array do | |
describe '#ranks' do | |
it { [100, 80, 90, 90, 90, 70, 70, 80].ranks.should == [1, 5, 2, 2, 2, 7, 7, 5] } | |
end | |
end |
Author
naoty
commented
Sep 27, 2012
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