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Use andMap to incrementally decode a JSON object. Each andMap provides a value that will be an argument to a type constructor.
robinheghan
requested changes
Jan 3, 2026
src/Json/Decode.gren
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| ``` | ||
| -- The Type | ||
| type alias Info = | ||
| { height : Float | ||
| , age : Int | ||
| } | ||
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| -- The Constructor | ||
| makeInfo : Float -> Int -> Info | ||
| makeInfo height age = | ||
| { height = height | ||
| , age = age | ||
| } | ||
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| -- The Decoder | ||
| infoDecoder : Decoder Info | ||
| infoDecoder = | ||
| succeed makeInfo | ||
| |> andMap (field "height" float) | ||
| |> andMap (field "age" int) | ||
| ``` |
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The style in the rest of this package is to indent example code, instead of enclosing them with backticks.
Btw, have you checked to see how this is rendered?
You can get a preview using:
npm install gren-packages
gren-doc-preview
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Ok, I'll change the markdown.
Yes, I use gren-doc-preview for reviewing the rendering for all my doc commits. It's great to have that tool available.
Use indentation instead of backticks in the MarkDown
robinheghan
approved these changes
Jan 4, 2026
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Use andMap to incrementally decode a JSON object. Each andMap provides a value that will be an argument to a type constructor.