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6a023084 » Bryan Kang 2008-08-25 add jolly jumpers 1 class Array
2 def jolly?
3 differences.sort == (1...length).to_a
4 end
5
6 def differences
7 self[0..-2].zip(self[1..-1]).map{|x| (x[0] - x[1]).abs }
8 end
9 end
10
11 describe "Jolly Jumpers" do
12 it "서로 인접해 있는 두 수의 차를 계산한다" do
13 [1,4,2,3].differences.should == [3,2,1]
14 end
15
16 it "유쾌한 점퍼인가?" do
17 [1, 4, 2, 3].should be_jolly
18 [1, 4, 2, -1, 6].should_not be_jolly
19 end
20 end