Created
May 15, 2019 06:01
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| isReasonableAge : String -> Result String Int | |
| isReasonableAge input = | |
| case String.toInt input of | |
| Nothing -> | |
| Err "That is not a number!" | |
| Just age -> | |
| if age < 0 then | |
| Err "Please try again after you are born." | |
| else if age > 135 then | |
| Err "Are you some kind of turtle?" | |
| else | |
| Ok age |
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