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vzvu3k6k merged 1 commit into from
Jan 3, 2024
Merged

Add hamming_distance algorithm #213

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23 changes: 23 additions & 0 deletions strings/hamming_distance.rb
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Original file line number Diff line number Diff line change
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# https://en.wikipedia.org/wiki/Hamming_distance

def hamming_distance(str1, str2)
abort 'Strings must be of the same length' unless str1.length == str2.length

str1.chars.zip(str2.chars).sum { |chr1, chr2| chr1 == chr2 ? 0 : 1 }
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@vzvu3k6k vzvu3k6k Jan 3, 2024

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Note: I think this code can be written a bit shorter as follows:

Suggested change
str1.chars.zip(str2.chars).sum { |chr1, chr2| chr1 == chr2 ? 0 : 1 }
str1.chars.zip(str2.chars).count { |chr1, chr2| chr1 != chr2 }

end

if $0 == __FILE__
# Valid inputs
puts hamming_distance 'ruby', 'rust'
# => 2
puts hamming_distance 'karolin', 'kathrin'
# => 3
puts hamming_distance 'kathrin', 'kerstin'
# => 4
puts hamming_distance '0000', '1111'
# => 4

# Invalid inputs
puts hamming_distance 'ruby', 'foobar'
# => Strings must be of the same length
end