ruby-版本判断

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def compare_app_version(current, old)
    return if current.blank? || old.blank?
    la = current.split('.')
    lb = old.split('.')
    i = 0 
    if la.length > lb.length
      len = la.length
    else
      len = lb.length
    end 
    while i <= len  do  
      if (la[i] && !lb[i] && la[i].to_i > 0) || (la[i].to_i > lb[i].to_i)
          return 1
      elsif (lb[i] && !la[i] && lb[i].to_i > 0) || (la[i].to_i < lb[i].to_i)
          return -1
      end 
      i +=1 
    end 
    return 0
  end