reflect.Tag.Get() 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.Tag.Get() Function in Golang is used to find the value associated with key in the tag string, an empty string is returned if there is no such key in the tag. To access this function, one needs to imports the reflect package in the program.
Syntax:
func (tag StructTag) Get(key string) string
Parameters: This function takes one parameters of string type, i.e. key.
Return Value: This function returns the value associated with key in the tag string.
Below examples illustrate the use of the above method in Golang:
Example 1:
package main
import (
"fmt"
"reflect"
)
type Employee struct {
ID string `auto_increment: "true" increment: "1" `
Name string `varchar: "255" `
Surname string ` "varchar: " 255"`
}
func main() {
e := Employee{}
c := reflect.TypeOf(e).Field(0).Tag
fmt.Printf( "%s\n\n" , c)
g := c.Get( "increment" )
fmt.Printf( "Get method: %s\n" , g)
}
|
Output:
auto_increment:"true" increment:"1"
Get method: 1
Example 2:
package main
import (
"fmt"
"reflect"
)
func main() {
type tag struct {
val string `Value_1: "GeeksforGeeks" Value_2: "Best Platform :" `
}
src := tag {}
st := reflect.TypeOf(src)
field := st.Field(0)
fmt.Println(field.Tag.Get( "Value_2" ), field.Tag.Get( "Value_1" ))
}
|
Output:
Best Platform : GeeksforGeeks
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