reflect.MapKeys() Function in Golang with Examples

reflect.MapKeys() 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.MapKeys() Function in Golang is used to get a slice containing all the keys present in the map, in unspecified order. To access this function, one needs to imports the reflect package in the program.

Syntax:
func (v Value) MapKeys() []Value
Parameters: This function does not accept any parameter. Return Value: This function returns a slice containing all the keys present in the map, in unspecified order.

Below examples illustrate the use of above method in Golang: Example 1:

C

// Golang program to illustrate
// reflect.MapKeys() Function
  
package main
  
import (
    "fmt"
    "reflect"
)

// Main function
func main() {
    key := 10
    value := "Geeksforgeeks"

    mapType := reflect.MapOf(reflect.TypeOf(key), reflect.TypeOf(value))

    mapValue := reflect.MakeMap(mapType)
    mapValue.SetMapIndex(reflect.ValueOf(key), reflect.ValueOf(value))

    keys := mapValue.MapKeys()
    fmt.Println(keys)

}

Output:

[<int Value>]

Example 2:

C

// Golang program to illustrate
// reflect.MapKeys() Function
  
package main
  
import (
    "fmt"
    "reflect"
)

// Main function
func main() {
    key := 1
    value := "abc"

    mapType := reflect.MapOf(reflect.TypeOf(key), reflect.TypeOf(value))

    mapValue := reflect.MakeMap(mapType)
    mapValue.SetMapIndex(reflect.ValueOf(key), reflect.ValueOf(value))
    mapValue.SetMapIndex(reflect.ValueOf(2), reflect.ValueOf("def"))
    mapValue.SetMapIndex(reflect.ValueOf(3), reflect.ValueOf("gh"))

    keys := mapValue.MapKeys()
    for _, k := range keys {
        c_key := k.Convert(mapValue.Type().Key())
        c_value := mapValue.MapIndex(c_key)
        fmt.Println("key :", c_key, " value:", c_value)
    }

}

Output:

key : 1  value: abc
key : 2  value: def
key : 3  value: gh

reflect.MapKeys() Function in Golang with Examples

S

SHUBHAMSINGH10

Improve

Article Tags :

Similar Reads

reflect.MakeMap() Function in Golang with Examples

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 nee

reflect.MapOf() Function in Golang with Examples

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.MapOf() Function in Golang is used to get the map type with the given key and element types, i.e., if k represent

reflect.MakeSlice() Function in Golang with Examples

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.MakeSlice() Function in Golang is used to create new zero-initialized slice value for the specified slice type, le

reflect.MapIndex() Function in Golang with Examples

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.MapIndex() Function in Golang is used to get the value associated with key in the map v. To access this function,

reflect.MakeFunc() Function in Golang with Examples

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.MakeFunc() Function in Golang is used to get the new function of the given Type that wraps the function fn. To acc

reflect.MakeChan() Function in Golang with Examples

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.MakeChan() Function in Golang is used to create a new channel with the specified type and buffer size. To access

reflect.New() Function in Golang with Examples

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.New() Function in Golang is used to get the Value representing a pointer to a new zero value for the specified typ

reflect.Len() Function in Golang with Examples

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.Len() Function in Golang is used to get the v's length. To access this function, one needs to imports the reflect

reflect.Kind() Function in Golang with Examples

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.Kind() Function in Golang is used to find the name of kind. To access this function, one needs to imports the ref

reflect.Pointer() Function in Golang with Examples

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.Pointer() Function in Golang is used to get the v's value as a uintptr. To access this function, one needs to imp