Add Json.Obj.empty and Json.Arr.empty constants (#1241)

zio · Jan 24, 2025 · 8b800e0 · 8b800e0
1 parent dfb8184
commit 8b800e0
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diff --git a/zio-json/shared/src/main/scala/zio/json/ast/ast.scala b/zio-json/shared/src/main/scala/zio/json/ast/ast.scala
@@ -378,6 +378,8 @@ object Json {
     override def mapObjectEntries(f: ((String, Json)) => (String, Json)): Json.Obj = Json.Obj(fields.map(f))
   }
   object Obj {
+    val empty: Obj = Obj(Chunk.empty)
+
     def apply(fields: (String, Json)*): Obj = Obj(Chunk(fields: _*))
 
     private lazy val objd = JsonDecoder.keyValueChunk[String, Json]
@@ -423,6 +425,8 @@ object Json {
     override def mapArrayValues(f: Json => Json): Json.Arr         = Json.Arr(elements.map(f))
   }
   object Arr {
+    val empty: Arr = Arr(Chunk.empty)
+
     def apply(elements: Json*): Arr = Arr(Chunk(elements: _*))
 
     private lazy val arrd = JsonDecoder.chunk[Json]

diff --git a/zio-json/shared/src/test/scala/zio/json/ast/JsonSpec.scala b/zio-json/shared/src/test/scala/zio/json/ast/JsonSpec.scala
@@ -1,5 +1,6 @@
 package zio.json.ast
 
+import zio.Chunk
 import zio.json._
 import zio.test.Assertion._
 import zio.test._
@@ -87,6 +88,8 @@ object JsonSpec extends ZIOSpecDefault {
             case fst :: snd :: Nil => fst != snd
             case _                 => false
           })
+          assertTrue(Json.Obj.empty == Json.Obj(Chunk.empty))
+          assertTrue(Json.Arr.empty == Json.Arr(Chunk.empty))
         },
         test("object order does not matter for equality") {
           val obj1 = Json.Obj(
@@ -146,6 +149,7 @@ object JsonSpec extends ZIOSpecDefault {
           )
 
           assertTrue(obj1.hashCode == obj2.hashCode)
+          assertTrue(Json.Obj.empty.hashCode == Json.Obj(Chunk.empty).hashCode)
         }
       ),
       suite("foldUp")(