interpolation

Node.js

const name = 'bob'
const age = 21
const message = `${name} is ${age} years old`
console.log(message)

Output

bob is 21 years old

Go

package main
import "fmt"
func main() {
    name := "bob"
    age := 21
    message := fmt.Sprintf("%s is %d years old", name, age)
    fmt.Println(message)
}

Output

bob is 21 years old