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Add isNull predicate #6

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Merged
garyb merged 1 commit into from
May 16, 2024
+9 −1
Merged

Add isNull predicate #6

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2 changes: 1 addition & 1 deletion src/JSON.purs
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Expand Up @@ -30,7 +30,7 @@ import Data.Function.Uncurried (runFn2, runFn3, runFn7)
import Data.Int as Int
import Data.Maybe (Maybe(..))
import JSON.Internal (JArray, JObject, JSON)
import JSON.Internal (JArray, JObject, JSON) as Exports
import JSON.Internal (JArray, JObject, JSON, isNull) as Exports
import JSON.Internal as Internal

-- | Attempts to parse a string as a JSON value. If parsing fails, an error message detailing the
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2 changes: 2 additions & 0 deletions src/JSON/Internal.js
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Expand Up @@ -57,3 +57,5 @@ export const _index = (nothing, just, ix, arr) =>
ix >= 0 && ix < arr.length ? just(arr[ix]) : nothing;

export const _append = (xs, ys) => xs.concat(ys);

export const isNull = (json) => json == null;
2 changes: 2 additions & 0 deletions src/JSON/Internal.purs
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Expand Up @@ -140,3 +140,5 @@ foreign import _append
JArray
JArray
JArray

foreign import isNull :: JSON -> Boolean
4 changes: 4 additions & 0 deletions test/Main.purs
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Expand Up @@ -35,6 +35,10 @@ main = do
assertTrue $ J.fromJObject (JO.fromEntries [ Tuple "a" (J.fromInt 1) ]) == J.fromJObject (JO.fromEntries [ Tuple "a" (J.fromInt 1) ])
assertTrue $ J.fromJObject (JO.fromEntries [ Tuple "a" (J.fromInt 1) ]) < J.fromJObject (JO.fromEntries [ Tuple "a" (J.fromInt 2) ])

log "Check isNull"
assertTrue $ J.isNull J.null
assertTrue $ not $ J.isNull (J.fromInt 1)

log "Check array index"
assertTrue $ JA.index (-1) (JA.fromArray (J.fromInt <$> [ 0, 2, 4 ])) == Nothing
assertTrue $ JA.index 0 (JA.fromArray (J.fromInt <$> [ 0, 2, 4 ])) == Just (J.fromInt 0)
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