reflect.Index() 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.Index() Function in Golang is used to get the v’s i’th element. To access this function, one needs to imports the reflect package in the program.
Syntax:
func (v Value) Index(i int) ValueParameters: This function does not accept any parameter.
Return Value: This function returns v’s i’th element.
Below examples illustrate the use of the above method in Golang:
Example 1:
// Golang program to illustrate // reflect.Index() Function package main import ( "fmt" "reflect" ) func main() { data := []string{ "Beginner1" , "Beginner2" , "Beginner3" } test(data) data1 := [] int {1, 2, 3} test(data1) } func test(t interface{}) { switch reflect.TypeOf(t).Kind() { case reflect.Slice: s := reflect.ValueOf(t) for i := 0; i < s.Len(); i++ { fmt.Println(s.Index(i)) } } } |
Output:
Beginner1 Beginner2 Beginner3 1 2 3
Example 2:
// Golang program to illustrate // reflect.Index() Function package main import ( "fmt" "reflect" ) func InvertSlice(args []reflect.Value) (result []reflect.Value) { inSlice, n := args[0], args[0].Len() outSlice := reflect.MakeSlice(inSlice.Type(), 0, n) for i := n-1; i >= 0; i-- { //Use of Index() method element := inSlice.Index(i) outSlice = reflect.Append(outSlice, element) } return []reflect.Value{outSlice} } func Bind(p interface{}, f func ([]reflect.Value) []reflect.Value) { invert := reflect.ValueOf(p).Elem() invert.Set(reflect.MakeFunc(invert.Type(), f)) } // Main function func main() { var invertInts func([] int ) [] int Bind(&invertInts, InvertSlice) fmt.Println(invertInts([] int {1, 2, 3, 4, 2, 3, 5})) } |
Output:
[5 3 2 4 3 2 1]
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