.: package:json-stream

Synonym for objectWithKey. The .: operators can be chained.

>>> let json = "{\"key1\": {\"nested-key\": 3}}"

>>> parseByteString ("key1" .: "nested-key" .: integer) json :: [Int]
> [3]

It works both as a standalone parser and as a part of objectOf parser

>>> let test = "[{\"name\": \"test1\", \"value\": 1}, {\"name\": \"test2\", \"value\": null}, {\"name\": \"test3\"}]"

>>> let person = objectOf $ (,) <$> "name" .: string <*> "value" .: integer .| (-1)

>>> let people = arrayOf person

>>> parseByteString people test :: [(T.Text, Int)]
[("test1",1),("test2",-1),("test3",-1)]

Returns Nothing if value is null or does not exist or match. Otherwise returns Just value.

key .:? val = optional (key .: val)

It could be similarly used in the objectOf parser