Cracking the Code Interview, Exercise 1.5
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#!/usr/bin/env ruby | |
module Ex0105 | |
def self.compress(str) | |
out = str.scan(/./).reduce([[], 't', 0]) do |(buf, cur, num), c| | |
if cur == c | |
[buf, cur, num + 1] | |
else | |
if num > 0 | |
buf << cur | |
buf << num.to_s | |
end | |
[buf, c, 1] | |
end | |
end.join | |
if out.size < str.size | |
out | |
else | |
str | |
end | |
end | |
end | |
if __FILE__ == $0 | |
for test in %w[a aaa aaaaaaaaaaac abc aabcccccaa] + [""] | |
puts "compress('#{test}'): '#{Ex0105.compress(test)}'" | |
end | |
end |
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