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bitops/digit_sum.rb

Created January 7, 2012 05:16
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Digit sum in Ruby 1.9.2
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digit_sum.rb
def digit_sum(n)
n.to_s.each_char.map {|c| c.to_i }.reduce(:+)
end
@obfuscoder
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Shorter and more understandable with:

n.to_s.chars.map(&:to_i).reduce(:+)

@iamparnab
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what about this one:
n.to_s.chars.inject { |sum,n| sum = sum.to_i + n.to_i}

@bilalfayyaz93
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n.digits.inject(:+)

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