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Add combinator for optional properties #7

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edsko wants to merge 1 commit into MedeaMelana:master from edsko:feature/optProp

edsko commented Feb 28, 2015

(Note that the implementation does not rely on defaultValue and hence does not rely on any Eq instances.)


          Add combinator for optional properties

0cbdaf2

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edsko commented Mar 1, 2015

Note that if we had the standard StackPrisms for Maybe, then we could just write

optProp :: Json a => Text -> Grammar Obj t (Maybe a :- t)
optProp propName = fromPrism just . prop propName <> fromPrism nothing

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