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prihandi/isbn_13.rb

Created January 15, 2018 04:51
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  1. prihandi created this gist Jan 15, 2018.
    6 changes: 6 additions & 0 deletions isbn_13.rb
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    Original file line number Diff line number Diff line change
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    def create_isbn13(isbn_12)
    isbn_arr = isbn_12.to_s.chars.map(&:to_i)
    sumarr = isbn_arr.each.with_index.inject(0) { |sum,(value,index)| index.even? ? sum+(value*1) : sum+(value*3) }
    last_digit = (10 - (sumarr % 10)) % 10
    isbn13 = isbn_12.to_s + last_digit.to_s
    end