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upinetree/reverse_number.rb

Created April 8, 2014 15:06
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reverse_number
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reverse_number.rb
def reverse_number(num)
(Math.log10(num) + 1).floor.times.map{ |digit| (num/10**digit)%10 }.inject{ |sum, n| sum*10 + n }
end
reverse_number 987654321
# => 123456789
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