omap

Documentation

Index

• type OrderedMap
  • func NewOrderedMap() *OrderedMap
  • func (o *OrderedMap) Get(k string) json.RawMessage
  • func (o *OrderedMap) MarshalJSON() ([]byte, error)
  • func (o *OrderedMap) Set(k string, v json.RawMessage)
  • func (o *OrderedMap) UnmarshalJSON(b []byte) error

Examples

• OrderedMap.Get
• OrderedMap.Set

Types

type OrderedMap

type OrderedMap struct {
	// contains filtered or unexported fields
}

An OrderedMap keeps track of the order keys are placed in it

Rather than be recursive, the values are of type json.RawMessage and thus can be decoded separately

func NewOrderedMap

func NewOrderedMap() *OrderedMap

NewOrderedMap returns a new OrderedMap

func (*OrderedMap) Get

func (o *OrderedMap) Get(k string) json.RawMessage

Get returns the json value associated with a key

Example

jsonData := `{
		"z": 1,
		"a": 2
	}`

m := NewOrderedMap()
err := json.Unmarshal([]byte(jsonData), &m)
if err != nil {
	fmt.Println("error:", err)
}
var val int
err = json.Unmarshal(m.Get("z"), &val)
if err != nil {
	fmt.Println("error:", err)
}

fmt.Println(val)

Output:

1

func (*OrderedMap) MarshalJSON

func (o *OrderedMap) MarshalJSON() ([]byte, error)

func (*OrderedMap) Set

func (o *OrderedMap) Set(k string, v json.RawMessage)

Set sets the value of a key

If the key already exists in the map it will retain its position otherwise it will be placed at the end

Example

jsonData := `{
		"z": 1,
		"a": 2
	}`

m := NewOrderedMap()
err := json.Unmarshal([]byte(jsonData), &m)
if err != nil {
	fmt.Println("error:", err)
}
newVal := 3
newData, err := json.Marshal(&newVal)
if err != nil {
	fmt.Println("error:", err)
}
m.Set("z", newData)
data, err := json.Marshal(&m)
if err != nil {
	fmt.Println("error:", err)
}
fmt.Println(string(data))

Output:

{"z":3,"a":2}

func (*OrderedMap) UnmarshalJSON

func (o *OrderedMap) UnmarshalJSON(b []byte) error