Short variable declarations

Short Variable Declarations#

Inside a function, the := short assignment statement can be used in place of a var declaration with implicit type.

Outside a function, every statement begins with a keyword (var, func, and so on) and so the := construct is not available.

Example 1: Printing Variable Values#

example.go

package main
 
import string">"fmt"
 
func main() {
	a := 10
	b := string">"golang"
	c := 4.17
	d := true
	e := string">"Hello"
	f := string">`Do you like my hat?`
	g := string">'M'
	fmt.Printf(string">"%v \n", a)
	fmt.Printf(string">"%v \n", b)
	fmt.Printf(string">"%v \n", c)
	fmt.Printf(string">"%v \n", d)
	fmt.Printf(string">"%v \n", e)
	fmt.Printf(string">"%v \n", f)
	fmt.Printf(string">"%v \n", g)
}

Run in Go Playground →

%v is the format verb for printing values in a default format. It will give you the values of variables.

Example 2: Printing Variable Types#

example.go

package main
 
import string">"fmt"
 
func main() {
	a := 10
	b := string">"golang"
	c := 4.17
	d := true
	e := string">"Hello"
	f := string">`Do you like my hat?`
	g := string">'M'
 
	fmt.Printf(string">"%T \n", a)
	fmt.Printf(string">"%T \n", b)
	fmt.Printf(string">"%T \n", c)
	fmt.Printf(string">"%T \n", d)
	fmt.Printf(string">"%T \n", e)
	fmt.Printf(string">"%T \n", f)
	fmt.Printf(string">"%T \n", g)
}

Run in Go Playground →

The %T format verb provides a Go-syntax representation of the type of the value. In this example, it shows the type of each variable.

example.go

package main
 
import string">"fmt"
 
func main() {
 
	a := 10
	b := string">"golang"
	c := 4.17
	d := true
	e := string">"Hello"
	f := string">`Do you like my hat?`
	g := string">'M'
 
	fmt.Printf(string">"%T \n", a)
	fmt.Printf(string">"%T \n", b)
	fmt.Printf(string">"%T \n", c)
	fmt.Printf(string">"%T \n", d)
	fmt.Printf(string">"%T \n", e)
	fmt.Printf(string">"%T \n", f)
	fmt.Printf(string">"%T \n", g)
}

RUN

%T a Go-syntax representation of the type of the value in this above go program %T provide you the type of variable