reflect.TypeOf() Function in Golang with Examples
Last Updated :
28 Apr, 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.TypeOf() Function in Golang is used to get the reflection Type that represents the dynamic type of i. To access this function, one needs to imports the reflect package in the program.
Syntax:
func TypeOf(i interface{}) Type
Parameters: This function takes only one parameters of interface( i ).
Return Value: This function returns the reflection Type.
Below examples illustrate the use of above method in Golang:
Example 1:
package main
import (
"fmt"
"reflect"
)
func main() {
tst1 := "string"
tst2 := 10
tst3 := 1.2
tst4 := true
tst5 := []string{ "foo" , "bar" , "baz" }
tst6 := map[string] int { "apple" : 23, "tomato" : 13}
fmt.Println(reflect.TypeOf(tst1))
fmt.Println(reflect.TypeOf(tst2))
fmt.Println(reflect.TypeOf(tst3))
fmt.Println(reflect.TypeOf(tst4))
fmt.Println(reflect.TypeOf(tst5))
fmt.Println(reflect.TypeOf(tst6))
}
|
Output:
string
int
float64
bool
[]string
map[string]int
Example 2:
package main
import (
"fmt"
"io"
"os"
"reflect"
)
func main() {
tt := reflect.TypeOf((*io.Writer)(nil)).Elem()
fileType := reflect.TypeOf((*os.File)(nil))
fmt.Println(fileType.Implements(tt))
}
|
Output:
true
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