Golang templates "minus" function

Question

I know that in go templates I can call function named add for expression like 1 + 1. But how named function for expression like 2 - 1?

Answer 1

There is no add function included by default. You can however, easily write such functions yourself. For example:

tmpl := template.Must(template.New("").Funcs(template.FuncMap{
    "minus": func(a, b int) int {
        return a - b
    },
}).Parse("{{ minus 5 2 }}"))
tmpl.Execute(os.Stdout, nil)