Golang template : Use pipe to uppercase string

Just use a FuncMap like this (playground) to inject the ToUpper function into your template.

import (
    "bytes"
    "fmt"
    "strings"
    "text/template"
)

type TemplateData struct {
    Name string
}

func main() {
    funcMap := template.FuncMap{
        "ToUpper": strings.ToUpper,
    }

    tmpl, _ := template.New("myTemplate").Funcs(funcMap).Parse(string("{{ .Name | ToUpper  }}"))

    templateDate := TemplateData{"Hello"}
    var result bytes.Buffer

    tmpl.Execute(&result, templateDate)
    fmt.Println(result.String())
}