Golang : Interpolating or substituting variables in string examples
For this quick tutorial, we will explore how to interpolate(substitute) actual data into variables inside a string. Will keep these examples as simple as possible and once you are comfortable, do explore the advanced example at https://www.socketloop.com/tutorials/golang-auto-generate-reply-email-with-text-template-package
Example 1:
package main
import (
"fmt"
)
func main() {
msg := "%s has %d messages."
name := "Steve"
num := 50
result := fmt.Sprintf(msg, name, num)
fmt.Println(result)
}
Output:
Steve has 50 messages.
To substitute more variables ( higher than 3), it is recommended to use the text/template
package.
Example 2:
package main
import (
"fmt"
"os"
"text/template"
)
type Data struct {
Name string // has to be uppercase/exportable/public
Num uint // for the interpolation/substitution to work
}
func main() {
msg := "{{.Name}} has {{.Num}} messages.\n"
substitute := Data{"Steve", 50}
tmpl, err := template.New("msg").Parse(msg)
err = tmpl.Execute(os.Stdout, substitute)
if err != nil {
fmt.Println(err)
}
}
Output:
Steve has 50 messages.
References:
https://www.socketloop.com/tutorials/golang-auto-generate-reply-email-with-text-template-package
https://golang.org/pkg/text/template/
https://www.socketloop.com/tutorials/golang-find-replace-character-in-string
See also : Golang : Auto-generate reply email with text/template package
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+14k PHP : Convert(cast) string to bigInt
+10.7k Golang : Simple client server example
+1.3k MariaDB/MySQL : How to get version information
+4.5k Golang : GTK Input dialog box examples
+3.7k Golang : Calculate Relative Strength Index(RSI) example
+14k Golang : Read input from console line
+2.9k Javascript : Generate random key with specific length
+3.6k Golang : Eroding and dilating image with OpenCV example
+13.4k Golang : Delete duplicate items from a slice/array
+3.6k Fix ERROR 1045 (28000): Access denied for user 'root'@'ip-address' (using password: YES)
+1.7k Golang : Mapping Iban to Dunging alphabets
+3k Fix sudo yum hang problem with no output or error messages