reflect.Tag.Get() Function in Golang with Examples

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:

C

// Golang program to illustrate
// reflect.Tag.Get() Function

package main

import (
    "fmt"
    "reflect"
)

type Employee struct {
    ID      string `auto_increment:"true" increment:"1"`
    Name    string `varchar: "255"`
    Surname string `"varchar: "255"`
}

// Main function
func main() {
    e := Employee{}
    // c variable represents table columns
    c := reflect.TypeOf(e).Field(0).Tag
    fmt.Printf("%s\n\n", c)

    // use of Get method
    g := c.Get("increment")
    fmt.Printf("Get method: %s\n", g)
}

Output:

auto_increment:"true" increment:"1"

Get method: 1

Example 2:

C

// Golang program to illustrate
// reflect.Tag.Get() Function 

package main

import (
    "fmt"
    "reflect"
)

// Main function 
func main() {
    type tag struct {
        val string `Value_1:"GeeksforGeeks" Value_2:"Best Platform :"`
    }

    src := tag {}
    st := reflect.TypeOf(src)
    field := st.Field(0)
    
    // use of Get method
    fmt.Println(field.Tag.Get("Value_2"), field.Tag.Get("Value_1"))

}

Output:

Best Platform : GeeksforGeeks

reflect.Tag.Get() Function in Golang with Examples

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SHUBHAMSINGH10

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