# using strings def remove_trailing_zeros(number) number .to_s .gsub(/0{1,}$/,"") .to_i || 0 end
def remove_trailing_zeros(number) return 0 if number == 0 return remove_trailing_zeros(number / 10) if number % 10 == 0 return number end
TESTS
require "test/unit" class RemoveTrailingZerosTest < Test::Unit::TestCase def test_remove_trailing_zeros assert_equal 907, remove_trailing_zeros(9070) assert_equal 21, remove_trailing_zeros(210000) assert_equal 1021, remove_trailing_zeros(10210) assert_equal 0, remove_trailing_zeros(0) end end
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Ruby
Regex
Recursion
TESTS