Generic - Methods

tip

The following list of common methods may become outdated compared to new features in the code. For more methods and examples, please refer to the code documentation: https://pkg.go.dev/github.com/gogf/gf/v2/container/gvar

New

• Description: New creates and returns a new Var with the given value. The optional parameter safe specifies whether to use Var in a concurrent-safe manner, with a default value of false.
• Format:

func New(value interface{}, safe ...bool) *Var

• Example:

// New
func ExampleVarNew() {
      v := gvar.New(400)
      g.Dump(v)

      // Output:
      // "400"
}

Clone

• Description: Clone performs a shallow copy of the current Var and returns a pointer to this Var.
• Format:

func (v *Var) Clone() *Var

• Example

// Clone
func ExampleVar_Clone() {
      tmp := "fisrt hello"
      v := gvar.New(tmp)
      g.DumpWithType(v.Clone())
      fmt.Println(v == v.Clone())

      // Output:
      // *gvar.Var(11) "fisrt hello"
      // false
}

Set

• Description: Set sets the value of v to value and returns the old value of v.
• Format:

func (v *Var) Set(value interface{}) (old interface{})

• Example:

// Set
func ExampleVar_Set() {
      var v = gvar.New(100.00)
      g.Dump(v.Set(200.00))
      g.Dump(v)

      // Output:
      // 100
      // "200"
}

Val

• Description: Val returns the current value of v, with a type of interface{}.
• Format:

func (v *Var) Val() interface{}

• Example:

// Val
func ExampleVar_Val() {
      var v = gvar.New(100.00)
      g.DumpWithType(v.Val())

      // Output:
      // float64(100)
}

Interface

• Description: Interface is an alias for Val.
• Format:

func (v *Var) Interface() interface{}

• Example:

// Interface
func ExampleVar_Interface() {
      var v = gvar.New(100.00)
      g.DumpWithType(v.Interface())

      // Output:
      // float64(100)
}

Bytes

• Description: Bytes converts v to a byte array.
• Format:

func (v *Var) Bytes() []byte

• Example:

// Bytes
func ExampleVar_Bytes() {
      var v = gvar.New("GoFrame")
      g.DumpWithType(v.Bytes())

      // Output:
      // []byte(7) "GoFrame"
}

String

• Description: String converts v to a string.
• Format:

func (v *Var) String() string

• Example:

// String
func ExampleVar_String() {
      var v = gvar.New("GoFrame")
      g.DumpWithType(v.String())

      // Output:
      // string(7) "GoFrame"
}

Bool

• Description: Bool converts v to a boolean value.
• Format:

func (v *Var) Bool() bool

• Example:

// Bool
func ExampleVar_Bool() {
      var v = gvar.New(true)
      g.DumpWithType(v.Bool())

      // Output:
      // bool(true)
}

Int

• Description: Int converts v to an integer type.
• Format:

func (v *Var) Int() int

• Example:

// Int
func ExampleVar_Int() {
      var v = gvar.New(-1000)
      g.DumpWithType(v.Int())

      // Output:
      // int(-1000)
}

Uint

• Description: Uint converts v to an unsigned integer type.
• Format:

func (v *Var) Uint() uint

• Example:

// Uint
func ExampleVar_Uint() {
      var v = gvar.New(1000)
      g.DumpWithType(v.Uint())

      // Output:
      // uint(1000)
}

Float32

• Description: Float32 converts v to a 32-bit float type.
• Format:

func (v *Var) Float32() float32

• Example:

// Float32
func ExampleVar_Float32() {
      var price = gvar.New(100.00)
      g.DumpWithType(price.Float32())

      // Output:
      // float32(100)
}

Float64

• Description: Float64 converts v to a 64-bit float type.
• Format:

func (v *Var) Float64() float64

• Example:

// Float32
func ExampleVar_Float64() {
      var price = gvar.New(100.00)
      g.DumpWithType(price.Float64())

      // Output:
      // float64(100)
}

Time

• Description: Time converts v to time.Time. The format parameter is used to specify the time string format with gtime, e.g., Y-m-d H:i:s.
• Format:

func (v *Var) Time(format ...string) time.Time

• Example:

// Time
func ExampleVar_Time() {
      var v = gvar.New("2021-11-11 00:00:00")
      g.DumpWithType(v.Time())

      // Output:
      // time.Time(29) "2021-11-11 00:00:00 +0800 CST"
}

GTime

• Description: G``Time converts v to *gtime.Time. The format parameter is used to specify the time string format with gtime, e.g., Y-m-d H:i:s.
• Format:

func (v *Var) GTime(format ...string) *gtime.Time

• Example:

// GTime
func ExampleVar_GTime() {
      var v = gvar.New("2021-11-11 00:00:00")
      g.DumpWithType(v.GTime())

      // Output:
      // *gtime.Time(19) "2021-11-11 00:00:00"
}

Duration

• Description: Duration converts v to time.Duration. If the value of v is a string, it is converted using time.ParseDuration.
• Format:

func (v *Var) Duration() time.Duration

• Example:

// Duration
func ExampleVar_Duration() {
      var v = gvar.New("300s")
      g.DumpWithType(v.Duration())

      // Output:
      // time.Duration(4) "5m0s"
}

MarshalJSON

• Description: MarshalJSON implements the MarshalJSON method of the json interface.
• Format:

func (v *Var) MarshalJSON() ([]byte, error)

• Example:

// MarshalJSON
func ExampleVar_MarshalJSON() {
      testMap := g.Map{
          "code":  "0001",
          "name":  "Golang",
          "count": 10,
      }

      var v = gvar.New(testMap)
      res, err := json.Marshal(&v)
      if err != nil {
          panic(err)
      }
      g.DumpWithType(res)

      // Output:
      // []byte(42) "{"code":"0001","count":10,"name":"Golang"}"
}

UnmarshalJSON

• Description: UnmarshalJSON implements the UnmarshalJSON method of the json interface.
• Format:

func (v *Var) UnmarshalJSON(b []byte) error

• Example:

// UnmarshalJSON
func ExampleVar_UnmarshalJSON() {
      tmp := []byte(`{
           "Code":          "0003",
           "Name":          "Golang Book3",
           "Quantity":      3000,
           "Price":         300,
           "OnSale":        true
      }`)
      var v = gvar.New(map[string]interface{}{})
      if err := json.Unmarshal(tmp, &v); err != nil {
          panic(err)
      }

      g.Dump(v)

      // Output:
      // "{\"Code\":\"0003\",\"Name\":\"Golang Book3\",\"OnSale\":true,\"Price\":300,\"Quantity\":3000}"
}

UnmarshalValue

• Description: UnmarshalValue is an interface implementation that sets any type of value for Var.
• Format:

func (v *Var) UnmarshalValue(value interface{}) error

• Example:

// UnmarshalValue
func ExampleVar_UnmarshalValue() {
      tmp := g.Map{
          "code":  "00002",
          "name":  "GoFrame",
          "price": 100,
          "sale":  true,
      }

      var v = gvar.New(map[string]interface{}{})
      if err := v.UnmarshalValue(tmp); err != nil {
          panic(err)
      }
      g.Dump(v)

      // Output:
      // "{\"code\":\"00002\",\"name\":\"GoFrame\",\"price\":100,\"sale\":true}"
}

IsNil

• Description: IsNil checks if v is nil, returning true if it is nil, and false otherwise.
• Format:

func (v *Var) IsNil() bool

• Example:

/// IsNil
func ExampleVar_IsNil() {
      g.Dump(gvar.New(0).IsNil())
      g.Dump(gvar.New(0.1).IsNil())
      // true
      g.Dump(gvar.New(nil).IsNil())
      g.Dump(gvar.New("").IsNil())

      // Output:
      // false
      // false
      // true
      // false
}

IsEmpty

• Description: IsEmpty checks if v is empty, returning true if it is, and false otherwise.
• Format:

func (v *Var) IsEmpty() bool

• Example:

// IsEmpty
func ExampleVar_IsEmpty() {
      g.Dump(gvar.New(0).IsEmpty())
      g.Dump(gvar.New(nil).IsEmpty())
      g.Dump(gvar.New("").IsEmpty())
      g.Dump(gvar.New(g.Map{"k": "v"}).IsEmpty())

      // Output:
      // true
      // true
      // true
      // false
}

IsInt

• Description: IsInt checks if v is of int type, returning true if it is, and false otherwise.
• Format:

func (v *Var) IsInt() bool

• Example:

// IsInt
func ExampleVar_IsInt() {
      g.Dump(gvar.New(0).IsInt())
      g.Dump(gvar.New(0.1).IsInt())
      g.Dump(gvar.New(nil).IsInt())
      g.Dump(gvar.New("").IsInt())

      // Output:
      // true
      // false
      // false
      // false
}

IsUint

• Description: IsUint checks if v is of uint type, returning true if it is, and false otherwise.
• Format:

func (v *Var) IsUint() bool

• Example:

// IsUint
func ExampleVar_IsUint() {
      g.Dump(gvar.New(0).IsUint())
      g.Dump(gvar.New(uint8(8)).IsUint())
      g.Dump(gvar.New(nil).IsUint())

      // Output:
      // false
      // true
      // false
}

IsFloat

• Description: IsFloat checks if v is of float type, returning true if it is, and false otherwise.
• Format:

func (v *Var) IsFloat() bool

• Example:

// IsFloat
func ExampleVar_IsFloat() {
      g.Dump(g.NewVar(uint8(8)).IsFloat())
      g.Dump(g.NewVar(float64(8)).IsFloat())
      g.Dump(g.NewVar(0.1).IsFloat())

      // Output:
      // false
      // true
      // true
}

IsSlice

• Description: IsSlice checks if v is of slice type, returning true if it is, and false otherwise.
• Format:

func (v *Var) IsSlice() bool

• Example:

// IsSlice
func ExampleVar_IsSlice() {
      g.Dump(g.NewVar(0).IsSlice())
      g.Dump(g.NewVar(g.Slice{0}).IsSlice())

      // Output:
      // false
      // true
}

IsMap

• Description: IsMap checks if v is of map type, returning true if it is, and false otherwise.
• Format:

func (v *Var) IsMap() bool

• Example:

// IsMap
func ExampleVar_IsMap() {
      g.Dump(g.NewVar(0).IsMap())
      g.Dump(g.NewVar(g.Map{"k": "v"}).IsMap())
      g.Dump(g.NewVar(g.Slice{}).IsMap())

      // Output:
      // false
      // true
      // false
}

IsStruct

• Description: IsStruct checks if v is of struct type, returning true if it is, and false otherwise.
• Format:

func (v *Var) IsStruct() bool

• Example:

// IsStruct
func ExampleVar_IsStruct() {
      g.Dump(g.NewVar(0).IsStruct())
      g.Dump(g.NewVar(g.Map{"k": "v"}).IsStruct())

      a := struct{}{}
      g.Dump(g.NewVar(a).IsStruct())
      g.Dump(g.NewVar(&a).IsStruct())

      // Output:
      // false
      // false
      // true
      // true
}

ListItemValues

• Description: ListItemValues retrieves and returns all item elements of the struct/map with the key key. Note that the list parameter should be a slice type containing elements of map or struct, otherwise it will return an empty slice.
• Format:

func (v *Var) ListItemValues(key interface{}) (values []interface{})

• Example:

// ListItemValues
func ExampleVar_ListItemValues() {
      var goods1 = g.List{
          g.Map{"id": 1, "price": 100.00},
          g.Map{"id": 2, "price": 0},
          g.Map{"id": 3, "price": nil},
      }
      var v = gvar.New(goods1)
      fmt.Println(v.ListItemValues("id"))
      fmt.Println(v.ListItemValues("price"))

      // Output:
      // [1 2 3]
      // [100 0 <nil>]
}

ListItemValuesUnique

• Description: ListItemValuesUnique retrieves and returns all unique elements of the struct/map with the specified key. Note that the list parameter should be a slice type containing elements of map or struct, otherwise it will return an empty slice.
• Format:

func (v *Var) ListItemValuesUnique(key string) []interface{}

• Example:

// ListItemValuesUnique
func ExampleVar_ListItemValuesUnique() {
      var (
          goods1 = g.List{
              g.Map{"id": 1, "price": 100.00},
              g.Map{"id": 2, "price": 100.00},
              g.Map{"id": 3, "price": nil},
          }
          v = gvar.New(goods1)
      )

      fmt.Println(v.ListItemValuesUnique("id"))
      fmt.Println(v.ListItemValuesUnique("price"))

      // Output:
      // [1 2 3]
      // [100 <nil>]
}

Struct

• Description: Struct maps the value of v to the pointer. The pointer parameter should point to an instance of a struct. The mapping parameter is used to specify key-to-field mapping rules.
• Format:

func (v *Var) Struct(pointer interface{}, mapping ...map[string]string) error

• Example:

func ExampleVar_Struct() {
      params1 := g.Map{
          "uid":  1,
          "Name": "john",
      }
      v := gvar.New(params1)
      type tartget struct {
          Uid  int
          Name string
      }
      t := new(tartget)
      if err := v.Struct(&t); err != nil {
          panic(err)
      }
      g.Dump(t)

      // Output:
      // {
      //     Uid:  1,
      //     Name: "john",
      // }
}

Structs

• Description: Structs converts v to a slice type of the given struct. The pointer parameter should point to an instance of a struct. The mapping parameter is used to specify key-to-field mapping rules.
• Format:

func (v *Var) Structs(pointer interface{}, mapping ...map[string]string) error

• Example:

func ExampleVar_Structs() {
      paramsArray := []g.Map{}
      params1 := g.Map{
          "uid":  1,
          "Name": "golang",
      }
      params2 := g.Map{
          "uid":  2,
          "Name": "java",
      }

      paramsArray = append(paramsArray, params1, params2)
      v := gvar.New(paramsArray)
      type tartget struct {
          Uid  int
          Name string
      }
      var t []tartget
      if err := v.Structs(&t); err != nil {
          panic(err)
      }
      g.DumpWithType(t)

      // Output:
      // []gvar_test.tartget(2) [
      //     gvar_test.tartget(2) {
      //         Uid:  int(1),
      //         Name: string(6) "golang",
      //     },
      //     gvar_test.tartget(2) {
      //         Uid:  int(2),
      //         Name: string(4) "java",
      //     },
      // ]
}

Ints

• Description: Ints converts v to []int.
• Format:

func (v *Var) Ints() []int

• Example:

// Ints
func ExampleVar_Ints() {
      var (
          arr = []int{1, 2, 3, 4, 5}
          obj = gvar.New(arr)
      )

      fmt.Println(obj.Ints())

      // Output:
      // [1 2 3 4 5]
}

Int64s

• Description: Int64s converts v to []int64.
• Format:

func (v *Var) Int64s() []int64

• Example:

// Int64s
func ExampleVar_Int64s() {
      var (
          arr = []int64{1, 2, 3, 4, 5}
          obj = gvar.New(arr)
      )

      fmt.Println(obj.Int64s())

      // Output:
      // [1 2 3 4 5]
}

Uints

• Description: Uints converts v to []uint.
• Format:

func (v *Var) Uints() []uint

• Example:

// Uints
func ExampleVar_Uints() {
      var (
          arr = []uint{1, 2, 3, 4, 5}
          obj = gvar.New(arr)
      )
      fmt.Println(obj.Uints())

      // Output:
      // [1 2 3 4 5]
}

Uint64s

• Description: Uint64s converts v to []uint64.
• Format:

func (v *Var) Uint64s() []uint64

• Example:

// Uint64s
func ExampleVar_Uint64s() {
      var (
          arr = []uint64{1, 2, 3, 4, 5}
          obj = gvar.New(arr)
      )

      fmt.Println(obj.Uint64s())

      // Output:
      // [1 2 3 4 5]
}

Floats

• Description: Floats is an alias for Float64s.
• Format:

func (v *Var) Floats() []float64

• Example:

// Floats
func ExampleVar_Floats() {
      var (
          arr = []float64{1, 2, 3, 4, 5}
          obj = gvar.New(arr)
      )

      fmt.Println(obj.Floats())

      // Output:
      // [1 2 3 4 5]
}

Float64s

• Description: Float64s converts v to []float64.
• Format:

func (v *Var) Float64s() []float64

• Example:

// Float64s
func ExampleVar_Float64s() {
      var (
          arr = []float64{1, 2, 3, 4, 5}
          obj = gvar.New(arr)
      )

      fmt.Println(obj.Float64s())

      // Output:
      // [1 2 3 4 5]
}

Float32s

• Description: Float32s converts v to []float32.
• Format:

func (v *Var) Float32s() []float32

• Example:

// Float32s
func ExampleVar_Float32s() {
      var (
          arr = []float32{1, 2, 3, 4, 5}
          obj = gvar.New(arr)
      )

      fmt.Println(obj.Float32s())

      // Output:
      // [1 2 3 4 5]
}

Strings

• Description: Strings converts v to []string.
• Format:

func (v *Var) Strings() []string

• Example:

// Strings
func ExampleVar_Strings() {
      var (
          arr = []string{"GoFrame", "Golang"}
          obj = gvar.New(arr)
      )
      fmt.Println(obj.Strings())

      // Output:
      // [GoFrame Golang]
}

Interfaces

• Description: Interfaces converts v to []interface{}.
• Format:

func (v *Var) Interfaces() []interface{}

• Example:

// Interfaces
func ExampleVar_Interfaces() {
      var (
          arr = []string{"GoFrame", "Golang"}
          obj = gvar.New(arr)
      )

      fmt.Println(obj.Interfaces())

      // Output:
      // [GoFrame Golang]
}

Slice

• Description: Slice is an alias for Interfaces.
• Format:

func (v *Var) Slice() []interface{}

• Example:

// Slice
func ExampleVar_Slice() {
      var (
          arr = []string{"GoFrame", "Golang"}
          obj = gvar.New(arr)
      )

      fmt.Println(obj.Slice())

      // Output:
      // [GoFrame Golang]
}

Array

• Description: Array is an alias for Interfaces.
• Format:

func (v *Var) Array() []interface{}

• Example:

// Array
func ExampleVar_Array() {
      var (
          arr = []string{"GoFrame", "Golang"}
          obj = gvar.New(arr)
      )
      fmt.Println(obj.Array())

      // Output:
      // [GoFrame Golang]
}

Vars

• Description: Vars converts v to []var.
• Format:

func (v *Var) Vars() []*Var

• Example:

// Vars
func ExampleVar_Vars() {
      var (
          arr = []string{"GoFrame", "Golang"}
          obj = gvar.New(arr)
      )

      fmt.Println(obj.Vars())

      // Output:
      // [GoFrame Golang]
}

Map

• Description: Map converts v to map[string]interface{}.
• Format:

func (v *Var) Map(tags ...string) map[string]interface{}

• Example:

// Map
func ExampleVar_Map() {
      var (
          m   = g.Map{"id": 1, "price": 100.00}
          v   = gvar.New(m)
          res = v.Map()
      )

      fmt.Println(res["id"], res["price"])

      // Output:
      // 1 100
}

MapStrAny

• Description: MapStrAny is similar to the Map function but implements the MapStrAny interface.
• Format:

func (v *Var) MapStrAny() map[string]interface{}

• Example:

// MapStrAny
func ExampleVar_MapStrAny() {
      var (
          m1 = g.Map{"id": 1, "price": 100}
          v  = gvar.New(m1)
          v2 = v.MapStrAny()
      )

      fmt.Println(v2["price"], v2["id"])

      // Output:
      // 100 1
}

MapStrStr

• Description: MapStrStr converts v to map[string]string.
• Format:

func (v *Var) MapStrStr(tags ...string) map[string]string

• Example:

// MapStrStr
func ExampleVar_MapStrStr() {
      var (
          m1 = g.Map{"id": 1, "price": 100}
          v  = gvar.New(m1)
          v2 = v.MapStrStr()
      )

      fmt.Println(v2["price"] + "$")

      // Output:
      // 100$
}

MapStrVar

• Description: MapStrVar converts v to map[string]*Var.
• Format:

func (v *Var) MapStrVar(tags ...string) map[string]*Var

• Example:

// MapStrVar
func ExampleVar_MapStrVar() {
      var (
          m1 = g.Map{"id": 1, "price": 100}
          v  = gvar.New(m1)
          v2 = v.MapStrVar()
      )

      fmt.Println(v2["price"].Float64() * 100)

      // Output:
      // 10000
}

MapDeep

• Description: MapDeep recursively converts v to map[string]interface{}.
• Format:

func (v *Var) MapDeep(tags ...string) map[string]interface{}

• Example:

// MapDeep
func ExampleVar_MapDeep() {
      var (
          m1 = g.Map{"id": 1, "price": 100}
          m2 = g.Map{"product": m1}
          v  = gvar.New(m2)
          v2 = v.MapDeep()
      )

      fmt.Println(v2["product"])

      // Output:
      // map[id:1 price:100]
}

MapStrStrDeep

• Description: MapStrStrDeep recursively converts v to map[string]string.
• Format:

func (v *Var) MapStrStrDeep(tags ...string) map[string]string

• Example:

// MapStrStrDeep
func ExampleVar_MapStrStrDeep() {
      var (
          m1 = g.Map{"id": 1, "price": 100}
          m2 = g.Map{"product": m1}
          v  = gvar.New(m2)
          v2 = v.MapStrStrDeep()
      )

      fmt.Println(v2["product"])

      // Output:
      // {"id":1,"price":100}
}

MapStrVarDeep

• Description: MapStrVarDeep recursively converts v to map[string]*Var.
• Format:

func (v *Var) MapStrVarDeep(tags ...string) map[string]*Var

• Example:

// MapStrVarDeep
func ExampleVar_MapStrVarDeep() {
      var (
          m1 = g.Map{"id": 1, "price": 100}
          m2 = g.Map{"product": m1}
          v  = gvar.New(m2)
          v2 = v.MapStrVarDeep()
      )

      fmt.Println(v2["product"])

      // Output:
      // {"id":1,"price":100}
}

Maps

• Description: Maps converts v to map[string]interface{}.
• Format:

func (v *Var) Maps(tags ...string) []map[string]interface{}

• Example:

// Maps
func ExampleVar_Maps() {
      var m = gvar.New(g.ListIntInt{g.MapIntInt{0: 100, 1: 200}, g.MapIntInt{0: 300, 1: 400}})
      fmt.Printf("%#v", m.Maps())

      // Output:
      // []map[string]interface {}{map[string]interface {}{"0":100, "1":200}, map[string]interface {}{"0":300, "1":400}}
}

MapsDeep

• Description: MapsDeep recursively converts v to []map[string]interface{}.
• Format:

func (v *Var) MapsDeep(tags ...string) []map[string]interface{}

• Example:

// MapsDeep
func ExampleVar_MapsDeep() {
      var (
          p1 = g.MapStrAny{"product": g.Map{"id": 1, "price": 100}}
          p2 = g.MapStrAny{"product": g.Map{"id": 2, "price": 200}}
          v  = gvar.New(g.ListStrAny{p1, p2})
          v2 = v.MapsDeep()
      )

      fmt.Printf("%#v", v2)

      // Output:
      // []map[string]interface {}{map[string]interface {}{"product":map[string]interface {}{"id":1, "price":100}}, map[string]interface {}{"product":map[string]interface {}{"id":2, "price":200}}}
}

MapToMap

• Description: MapToMap converts v to the map type specified by pointer, with mapping as the specified mapping rules.
• Format:

func (v *Var) MapToMap(pointer interface{}, mapping ...map[string]string) (err error)

• Example:

// MapToMap
func ExampleVar_MapToMap() {
      var (
          m1 = gvar.New(g.MapIntInt{0: 100, 1: 200})
          m2 = g.MapStrStr{}
      )

      err := m1.MapToMap(&m2)
      if err != nil {
          panic(err)
      }

      fmt.Printf("%#v", m2)

      // Output:
      // map[string]string{"0":"100", "1":"200"}
}

MapToMaps

• Description: MapToMaps converts v to the map type specified by pointer, with mapping as the specified mapping rules.
• Format:

func (v *Var) MapToMaps(pointer interface{}, mapping ...map[string]string) (err error)

• Example:

// MapToMaps
func ExampleVar_MapToMaps() {
      var (
          p1 = g.MapStrAny{"product": g.Map{"id": 1, "price": 100}}
          p2 = g.MapStrAny{"product": g.Map{"id": 2, "price": 200}}
          v  = gvar.New(g.ListStrAny{p1, p2})
          v2 []g.MapStrStr
      )

      err := v.MapToMaps(&v2)
      if err != nil {
          panic(err)
      }
      fmt.Printf("%#v", v2)

      // Output:
      // []map[string]string{map[string]string{"product":"{\"id\":1,\"price\":100}"}, map[string]string{"product":"{\"id\":2,\"price\":200}"}}
}

MapToMapsDeep

• Description: MapToMapsDeep recursively converts v to the map type specified by pointer, with mapping as the designated mapping rules.
• Format:

func (v *Var) MapToMapsDeep(pointer interface{}, mapping ...map[string]string) (err error)

• Example:

// MapToMapDeep
func ExampleVar_MapToMapDeep() {
      var (
          p1 = gvar.New(g.MapStrAny{"product": g.Map{"id": 1, "price": 100}})
          p2 = g.MapStrAny{}
      )

      err := p1.MapToMap(&p2)
      if err != nil {
          panic(err)
      }
      fmt.Printf("%#v", p2)

      // Output:
      // map[string]interface {}{"product":map[string]interface {}{"id":1, "price":100}}
}

Scan

• Description: Scan automatically checks the type of pointer and converts params to pointer. Supported types for pointer are: *map, *[]map, *[]*map, *struct, **struct, *[]struct, *[]*struct
• Format:

func (v *Var) Scan(pointer interface{}, mapping ...map[string]string) error

• Example:

// Scan
func ExampleVar_Scan() {
      type Student struct {
          Id     *g.Var
          Name   *g.Var
          Scores *g.Var
      }
      var (
          s Student
          m = g.Map{
              "Id":     1,
              "Name":   "john",
              "Scores": []int{100, 99, 98},
          }
      )
      if err := gconv.Scan(m, &s); err != nil {
          panic(err)
      }

      g.DumpWithType(s)

      // Output:
      // gvar_test.Student(3) {
      //     Id:     *gvar.Var(1) "1",
      //     Name:   *gvar.Var(4) "john",
      //     Scores: *gvar.Var(11) "[100,99,98]",
      // }
}