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Contents
describe Integer, "#triangular?" do
TRIANGULAR = [0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,
136,153,171,190,210,231,253,276,300,325,351,378,
406,435,465,496,528,561,595,630,666,703,741,780,
820,861,903,946,990,1035,1081,1128,1176,1225,1275,
1326,1378,1431]
it "returns true for triangular numbers" do
TRIANGULAR.each do |number|
number.should be_triangular
end
end
it "returns false for non-triangular numbers" do
((1..1431).to_a - TRIANGULAR).each do |number|
number.should_not be_triangular
end
end
end
Version data entries
36 entries across 36 versions & 1 rubygems