I have a REST API that returns a json document, one field is numeric, mode. The values of the mode field are limited 0-3, they represent different states. To me this looks like an enum from other languages. What is the recommend way to represent this data in enum? I was thinking a Union type would b…

This is a great way to model this. For decoding you would map each number to the value that matches, and fail when an unexpected value is reached. Possibly something like import Json.Decode type Mode = Off | Heat | Cool | Auto decode : Json.Decode.Decoder Mode decode = Json.De…

Thank you that is exactly what I wound up doing.

Some different ways of doing Enums in Elm were discussed here: [image] How to do enums in Elm Learn TL;DR: I’ve made a working Ellie for this if you want to play around: https://ellie-app.com/nt22pfXCtKa1 I’ve seen a few comments around how working with enums suck in Elm…

If you end up dealing with a lot of Enums, this package I wrote might be helpful as well, reduces the boilerplate a bit: enum 1.0.1

Best way to represent an enum

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rupert November 16, 2021, 10:30am 4

Some different ways of doing Enums in Elm were discussed here:

Topic		Replies	Views
How to do enums in Elm Learn	10	8796	June 3, 2018
Enums, several different ways Request Feedback	4	951	October 30, 2019
Enum helper package? Request Feedback	14	1590	April 5, 2019
A tool for autogenerating code and en/de-coders of enum-like types Show and Tell	0	703	January 8, 2019
Mapping Tagged Union types to other languages? Learn	25	4867	November 14, 2018

Best way to represent an enum

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