More efficient dropping of null and [] values during serialization with jsoniter-scala-circe

Author: plokhotnyuk

jsoniter-scala-benchmark/shared/src/main/scala-2/com/github/plokhotnyuk/jsoniter_scala/benchmark/TwitterAPIWriting.scala

@@ -34,10 +34,9 @@ class TwitterAPIWriting extends TwitterAPIBenchmark {
   def circeJsoniter(): Array[Byte] = {
     import com.github.plokhotnyuk.jsoniter_scala.benchmark.CirceJsoniterCodecs._
     import com.github.plokhotnyuk.jsoniter_scala.core._
-    import io.circe.Util._
     import io.circe.syntax._
 
-    writeToArray(deepDropEmptyValues(obj.asJson))
+    writeToArray(obj.asJson)(jsonCodec2)
   }
 /* FIXME: DSL-JSON serializes empty collections
   @Benchmark

jsoniter-scala-benchmark/shared/src/main/scala-3/com/github/plokhotnyuk/jsoniter_scala/benchmark/TwitterAPIWriting.scala

@@ -25,10 +25,9 @@ class TwitterAPIWriting extends TwitterAPIBenchmark {
   def circeJsoniter(): Array[Byte] = {
     import com.github.plokhotnyuk.jsoniter_scala.benchmark.CirceJsoniterCodecs._
     import com.github.plokhotnyuk.jsoniter_scala.core._
-    import io.circe.Util._
     import io.circe.syntax._
 
-    writeToArray(deepDropEmptyValues(obj.asJson))
+    writeToArray(obj.asJson)(jsonCodec2)
   }
 
   @Benchmark

jsoniter-scala-benchmark/shared/src/main/scala/com/github/plokhotnyuk/jsoniter_scala/benchmark/CirceJsoniterCodecs.scala

@@ -19,6 +19,9 @@ object CirceJsoniterCodecs {
   val prettyConfig: WriterConfig = WriterConfig.withIndentionStep(2).withPreferredBufSize(32768)
   val tooLongStringConfig: ReaderConfig = ReaderConfig.withPreferredCharBufSize(1024 * 1024)
   implicit val jsonCodec: JsonValueCodec[Json] = JsoniterScalaCodec.jsonCodec(maxDepth = 512, doSerialize = _ ne Json.Null)
+  val jsonCodec2: JsonValueCodec[Json] = JsoniterScalaCodec.jsonCodec(maxDepth = 512, doSerialize = x => {
+    (x ne Json.Null) && !(x.isArray && x.asArray.get.isEmpty)
+  })
   val base64C3c: Codec[Array[Byte]] =
     Codec.from(Decoder.decodeString.map[Array[Byte]](Base64.getDecoder.decode),
       Encoder.encodeString.contramap[Array[Byte]](Base64.getEncoder.encodeToString))