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| type TrafficLight | |
| = Red | |
| | Yellow | |
| | Green | |
| allTrafficLight : List TrafficLight | |
| allTrafficLight = | |
| let | |
| helper list = | |
| case List.head list of | |
| Nothing -> | |
| Red :: list |> helper | |
| Just Red -> | |
| Yellow :: list |> helper | |
| Just Yellow -> | |
| Green :: list |> helper | |
| Just Green -> | |
| list | |
| in | |
| helper [] |
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