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reflect.MakeMap() Function in Golang with Examples

  • Last Updated : 03 May, 2020

Go language provides inbuilt support implementation of run-time reflection and allowing a program to manipulate objects with arbitrary types with the help of reflect package.The reflect.MakeMap() Function in Golang is used to create a new map with the specified type. To access this function, one needs to imports the reflect package in the program.

Syntax:

func MakeMap(typ Type) Value

Parameters: This function takes the following parameters:

  • typ : This parameter is the Type.

Return Value: This function returns a newly created map.

Below examples illustrate the use of above method in Golang:



Example 1:




// Golang program to illustrate
// reflect.MakeMap() Function
   
package main
   
import (
    "fmt"
    "reflect"
)
  
// Main function
func main() {
  
    var str map[int]string 
      
     var strValue reflect.Value = reflect.ValueOf(&str)
  
     indirectStr := reflect.Indirect(strValue)
      
    //Use of MakeMap() method
  
     valueMap := reflect.MakeMap(indirectStr.Type())
      
     fmt.Printf("ValueMap is [%v] .", valueMap)
  
}

Output:

ValueMap is [map[]] .

Example 2:




// Golang program to illustrate
// reflect.MakeMap() Function
   
package main
   
import (
    "fmt"
    "reflect"
)
  
// Main function
func main() {
      
    intSlice := make([]int, 0)
    mapStringInt := make(map[string]int)
  
    sliceType := reflect.TypeOf(intSlice)
    mapType := reflect.TypeOf(mapStringInt)
  
    intSliceReflect := reflect.MakeSlice(sliceType, 0, 0)
    mapReflect := reflect.MakeMap(mapType)
  
    v := 100
    rv := reflect.ValueOf(v)
    intSliceReflect = reflect.Append(intSliceReflect, rv)
    intSlice2 := intSliceReflect.Interface().([]int)
    fmt.Println(intSlice2)
  
    k := "GeeksforGeeks"
    rk := reflect.ValueOf(k)
    mapReflect.SetMapIndex(rk, rv)
    mapStringInt2 := mapReflect.Interface().(map[string]int)
    fmt.Println(mapStringInt2)
  
}

Output:

[100]
map[GeeksforGeeks:100]



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