Prevent Impossible States with JSON Decoders in Elm


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The part how it proposes to do the decoding with different constructors of a custom type is interesting.

In general the problem is the typical problem, how to encode tagged sum types in languages that don’t have them. In this case json. What status is in this example is often called kind or type. See https://github.com/gcanti/fp-ts/blob/master/fp-ts-for-purescripters.md#data


#3

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