ЯсноПонятно24

package main

import ( "encoding/json" "fmt" )

func splitJSONByClass(jsonData []byte) (map[string][]byte, error) { var data []map[string]interface{} err := json.Unmarshal(jsonData, &data) if err != nil { return nil, err }

result := make(map[string][]byte)

for _, item := range data {
	class := item["class"].(string)
	if _, ok := result[class]; !ok {
		result[class] = make([]byte, 0)
	}

	jsonItem, err := json.Marshal(item)
	if err != nil {
		return nil, err
	}

	result[class] = append(result[class], jsonItem...)
}

return result, nil

}

func main() { jsonData := []byte( [ {"name": "Alice", "class": "A"}, {"name": "Bob", "class": "B"}, {"name": "Charlie", "class": "A"}, {"name": "David", "class": "B"} ] )

result, err := splitJSONByClass(jsonData)
if err != nil {
	fmt.Println("Error:", err)
	return
}

for class, items := range result {
	fmt.Printf("Class %s:\n", class)
	fmt.Println(string(items))
}

}