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str_a = "the_quick_brown_fox"
str_b = "the_quick_red_fox"
 
puts (0...str_a.size).find {|i| str_a[i] != str_b[i] } || str_a.size

Success #stdin #stdout 0.05s 9656KB

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Standard input is empty

stdout

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https://ideone.com/275cEU

language:

Ruby (ruby 2.5.5)

created:

visibility:

public

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