How to Use Template Conditionals and Loops in Go

Go templates do not support conditionals or loops; use the html/template or text/template packages with if, range, and else directives in your template files.

package main

import (
	"os"
	"text/template"
)

func main() {
	tmpl := `{{if .}}Hello{{else}}Goodbye{{end}} {{range .}}- {{.}}{{end}}`
	t := template.Must(template.New("example").Parse(tmpl))
	t.Execute(os.Stdout, []string{"A", "B"})
}

Go templates are text files with special tags that let you insert data or repeat blocks of text. You use if to show content only when a condition is true, and range to loop through lists like an array of items. Think of it like filling out a form where some fields appear only if you check a box, and a list of names prints one by one.