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How to find the type of a variable in Golang

Shubham Singh Kshatriya

In Golang, we can find the type of a variable using:

  • The TypeOf function within the reflect package
  • The ValueOf.Kind function within the reflect package
  • The %T and Printf functions within the fmt package

reflect.TypeOf()

The reflect.TypeOf() function accepts a variable as a parameter and returns its type.

The code snippet given below shows us how to find the type of a variable, using this function:

package main

import (
	"fmt"
	"reflect"
)

func main() {
	// string
	var variable1 string
	// integer
	var variable2 int
	// float64
	var variable3 float64
	// bool
	var variable4 bool
	// slice
	var variable5 = []string{}

	fmt.Println("Type of variable1:",reflect.TypeOf(variable1))
	fmt.Println("Type of variable2:",reflect.TypeOf(variable2))
	fmt.Println("Type of variable3:",reflect.TypeOf(variable3))
	fmt.Println("Type of variable4:",reflect.TypeOf(variable4))
	fmt.Println("Type of variable5:",reflect.TypeOf(variable5))
}

reflect.ValueOf().Kind()

The reflect.ValueOf() function accepts a variable as a parameter. By appending the Kind() function to it, we can get the type of that variable.

The code snippet given below shows us how to find the type of a variable, using this function:

package main

import (
	"fmt"
	"reflect"
)

func main() {
	// string
	var variable1 string
	// integer
	var variable2 int
	// float64
	var variable3 float64
	// bool
	var variable4 bool
	// slice
	var variable5 = []string{}

	fmt.Println("Type of variable1:",reflect.ValueOf(variable1).Kind())
	fmt.Println("Type of variable2:",reflect.ValueOf(variable2).Kind())
	fmt.Println("Type of variable3:",reflect.ValueOf(variable3).Kind())
	fmt.Println("Type of variable4:",reflect.ValueOf(variable4).Kind())
	fmt.Println("Type of variable5:",reflect.ValueOf(variable5).Kind())
}

%T and Printf()

The fmt.Printf() function contains a format type %T that represents the type of a variable.

The code snippet given below shows us how to find the type of a variable, using this function:

package main

import (
	"fmt"
)

func main() {
// string
	var variable1 string
	// integer
	var variable2 int
	// float64
	var variable3 float64
	// bool
	var variable4 bool
	// slice
	var variable5 = []string{}

	fmt.Printf("Type of variable1: %T\n", variable1)
	fmt.Printf("Type of variable2: %T\n", variable2)
	fmt.Printf("Type of variable3: %T\n", variable3)
	fmt.Printf("Type of variable4: %T\n", variable4)
	fmt.Printf("Type of variable5: %T\n", variable5)
}

RELATED TAGS

golang
go
communitycreator

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Shubham Singh Kshatriya
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