嗨，我是 Fly，用 Ruby 寫 Chatbot 並挑戰30天分享心得
為確保不會沒靈感
每日含 Ruby 主題文章增加內容
https://github.com/leo424y/clean-code-ruby

避免型別確認

Bad:

def travel_to_texas(vehicle)
  if vehicle.is_a?(Bicycle)
    vehicle.pedal(@current_location, Location.new('texas'))
  elsif vehicle.is_a?(Car)
    vehicle.drive(@current_location, Location.new('texas'))
  end
end

Good:

def travel_to_texas(vehicle)
  vehicle.move(@current_location, Location.new('texas'))
end

### 再避免型別確認
工具 [contracts.ruby](https://github.com/egonSchiele/contracts.ruby)

**Bad:**
```ruby
def combine(val1, val2)
  if (val1.is_a?(Numeric) && val2.is_a?(Numeric)) ||
     (val1.is_a?(String) && val2.is_a?(String))
    return val1 + val2
  end

  raise 'Must be of type String or Numeric'
end

Good:

def combine(val1, val2)
  val1 + val2
end