I'm trying to add a value to a variable string in golang, without use printf because I'm using revel framework and this is for a web enviroment instead of console, this is the case:
data := 14
response := `Variable string content`
so I can't get variable data inside variable response, like this
response := `Variable string 14 content`
Any idea?
Why not use fmt.Sprintf?
data := 14
response := fmt.Sprintf("Variable string %d content", data)
I believe that the accepted answer is already the best practice one. Just like to give an alternative option based on @Ari Pratomo answer:
package main
import (
"fmt"
"strconv"
)
func main() {
data := 14
response := "Variable string " + strconv.Itoa(data) + " content"
fmt.Println(response) //Output: Variable string 14 content
}
It using strconv.Itoa() to convert an integer to string, so it can be concatenated with the rest of strings.
You can use text/template:
package main
import (
"strings"
"text/template"
)
func format(s string, v interface{}) string {
t, b := new(template.Template), new(strings.Builder)
template.Must(t.Parse(s)).Execute(b, v)
return b.String()
}
func main() {
data := 14
response := format("Variable string {{.}} content", data)
println(response)
}
If you want to keep the string in variable rather than to print out, try like this:
data := 14
response := "Variable string" + data + "content"
data is an Integer and you can not insert directly on String on this way. Otherwise you will have the following error: invalid operation: "Variable string" + data (mismatched types string and int)