Declaring a Short Hand Variable in Go

Inside a function, := is a short way to declare a variable and give it a starting value. Go determines the type from the value on the right. You will see this form often for local variables in The Golang Official Documentation

package main
 
import "fmt"
 
func main() {
	count := 10
	fmt.Printf("%v %T\n", count, count)
}

If you’ll run this with go run main.go, you’ll get the output 10 int

Here, count := 10 creates a new variable of type int, just like var count = 10 would have created. The output shows the value and the type so you can check what go chose. := only works inside a function so if you declare a variable outside a function like a global variable or something then use var