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27 lines
616 B
Ruby
27 lines
616 B
Ruby
# @param {Integer[]} nums
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# @return {Boolean}
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def contains_duplicate(nums)
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encountered = Set.new
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nums.each { |x|
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if encountered.add?(x) == nil then
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return true
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end
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}
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return false
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end
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RSpec.describe "contains_duplicate" do
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it "nums = [1,2,3,1] contains" do
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expect(contains_duplicate([1,2,3,1])).to be true
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end
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it "nums = [1,2,3,4] doesn't contain" do
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expect(contains_duplicate([1,2,3,4])).to be false
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end
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it "nums = [1,1,1,3,3,4,3,2,4,2] contains" do
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expect(contains_duplicate([1,1,1,3,3,4,3,2,4,2])).to be true
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end
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end
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